Erratic temp guage
12-26-2006, 08:00 PM
#1
Guest
Posts: n/a
Erratic temp guage
Good evening all. I have appeared here before with a erratic temp
gauge. After confirming that the engine block is not plugged, having a
new correct flow water pump installed, a recent radiator, new
thermostat, twice this week, and this evening a new temp sending unit,
my gauge still will not sit at 210. The old sending unit was corroded,
and fell apart when I removed it. I knew it was bad. The gauge used to
flucuate between 210 and 260. Up and down constantly. Now it goes up
and down between 210 and 235. When I first start it and let it warm up,
it hangs around 210, and when I start driving, it begins to move. Why.
Thanks,
Greg
gauge. After confirming that the engine block is not plugged, having a
new correct flow water pump installed, a recent radiator, new
thermostat, twice this week, and this evening a new temp sending unit,
my gauge still will not sit at 210. The old sending unit was corroded,
and fell apart when I removed it. I knew it was bad. The gauge used to
flucuate between 210 and 260. Up and down constantly. Now it goes up
and down between 210 and 235. When I first start it and let it warm up,
it hangs around 210, and when I start driving, it begins to move. Why.
Thanks,
Greg
12-26-2006, 08:26 PM
#2
Guest
Posts: n/a
Re: Erratic temp guage
That sounds within the normal range. My 258 runs right around there
too.
The faster you go, the more heat you create and energy you use. On a
hot summer day, I get borderline overheating and cap burps when I try to
go over 70 mph for any extended time. That is due to my winch and
lights interfering with the flow to the rad.
How's the oil level? I find mine runs a bit hotter when low a quart of
oil or when in need of a change.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
jerryg wrote:
>
> Good evening all. I have appeared here before with a erratic temp
> gauge. After confirming that the engine block is not plugged, having a
> new correct flow water pump installed, a recent radiator, new
> thermostat, twice this week, and this evening a new temp sending unit,
> my gauge still will not sit at 210. The old sending unit was corroded,
> and fell apart when I removed it. I knew it was bad. The gauge used to
> flucuate between 210 and 260. Up and down constantly. Now it goes up
> and down between 210 and 235. When I first start it and let it warm up,
> it hangs around 210, and when I start driving, it begins to move. Why.
>
> Thanks,
>
> Greg
too.
The faster you go, the more heat you create and energy you use. On a
hot summer day, I get borderline overheating and cap burps when I try to
go over 70 mph for any extended time. That is due to my winch and
lights interfering with the flow to the rad.
How's the oil level? I find mine runs a bit hotter when low a quart of
oil or when in need of a change.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
jerryg wrote:
>
> Good evening all. I have appeared here before with a erratic temp
> gauge. After confirming that the engine block is not plugged, having a
> new correct flow water pump installed, a recent radiator, new
> thermostat, twice this week, and this evening a new temp sending unit,
> my gauge still will not sit at 210. The old sending unit was corroded,
> and fell apart when I removed it. I knew it was bad. The gauge used to
> flucuate between 210 and 260. Up and down constantly. Now it goes up
> and down between 210 and 235. When I first start it and let it warm up,
> it hangs around 210, and when I start driving, it begins to move. Why.
>
> Thanks,
>
> Greg
12-26-2006, 08:26 PM
#3
Guest
Posts: n/a
Re: Erratic temp guage
That sounds within the normal range. My 258 runs right around there
too.
The faster you go, the more heat you create and energy you use. On a
hot summer day, I get borderline overheating and cap burps when I try to
go over 70 mph for any extended time. That is due to my winch and
lights interfering with the flow to the rad.
How's the oil level? I find mine runs a bit hotter when low a quart of
oil or when in need of a change.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
jerryg wrote:
>
> Good evening all. I have appeared here before with a erratic temp
> gauge. After confirming that the engine block is not plugged, having a
> new correct flow water pump installed, a recent radiator, new
> thermostat, twice this week, and this evening a new temp sending unit,
> my gauge still will not sit at 210. The old sending unit was corroded,
> and fell apart when I removed it. I knew it was bad. The gauge used to
> flucuate between 210 and 260. Up and down constantly. Now it goes up
> and down between 210 and 235. When I first start it and let it warm up,
> it hangs around 210, and when I start driving, it begins to move. Why.
>
> Thanks,
>
> Greg
too.
The faster you go, the more heat you create and energy you use. On a
hot summer day, I get borderline overheating and cap burps when I try to
go over 70 mph for any extended time. That is due to my winch and
lights interfering with the flow to the rad.
How's the oil level? I find mine runs a bit hotter when low a quart of
oil or when in need of a change.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
jerryg wrote:
>
> Good evening all. I have appeared here before with a erratic temp
> gauge. After confirming that the engine block is not plugged, having a
> new correct flow water pump installed, a recent radiator, new
> thermostat, twice this week, and this evening a new temp sending unit,
> my gauge still will not sit at 210. The old sending unit was corroded,
> and fell apart when I removed it. I knew it was bad. The gauge used to
> flucuate between 210 and 260. Up and down constantly. Now it goes up
> and down between 210 and 235. When I first start it and let it warm up,
> it hangs around 210, and when I start driving, it begins to move. Why.
>
> Thanks,
>
> Greg
12-26-2006, 08:26 PM
#4
Guest
Posts: n/a
Re: Erratic temp guage
That sounds within the normal range. My 258 runs right around there
too.
The faster you go, the more heat you create and energy you use. On a
hot summer day, I get borderline overheating and cap burps when I try to
go over 70 mph for any extended time. That is due to my winch and
lights interfering with the flow to the rad.
How's the oil level? I find mine runs a bit hotter when low a quart of
oil or when in need of a change.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
jerryg wrote:
>
> Good evening all. I have appeared here before with a erratic temp
> gauge. After confirming that the engine block is not plugged, having a
> new correct flow water pump installed, a recent radiator, new
> thermostat, twice this week, and this evening a new temp sending unit,
> my gauge still will not sit at 210. The old sending unit was corroded,
> and fell apart when I removed it. I knew it was bad. The gauge used to
> flucuate between 210 and 260. Up and down constantly. Now it goes up
> and down between 210 and 235. When I first start it and let it warm up,
> it hangs around 210, and when I start driving, it begins to move. Why.
>
> Thanks,
>
> Greg
too.
The faster you go, the more heat you create and energy you use. On a
hot summer day, I get borderline overheating and cap burps when I try to
go over 70 mph for any extended time. That is due to my winch and
lights interfering with the flow to the rad.
How's the oil level? I find mine runs a bit hotter when low a quart of
oil or when in need of a change.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
jerryg wrote:
>
> Good evening all. I have appeared here before with a erratic temp
> gauge. After confirming that the engine block is not plugged, having a
> new correct flow water pump installed, a recent radiator, new
> thermostat, twice this week, and this evening a new temp sending unit,
> my gauge still will not sit at 210. The old sending unit was corroded,
> and fell apart when I removed it. I knew it was bad. The gauge used to
> flucuate between 210 and 260. Up and down constantly. Now it goes up
> and down between 210 and 235. When I first start it and let it warm up,
> it hangs around 210, and when I start driving, it begins to move. Why.
>
> Thanks,
>
> Greg
12-26-2006, 09:20 PM
#5
Guest
Posts: n/a
Re: Erratic temp guage
Hi Mike, Well I just changed the oil. And It starts moving on me while
sitting in the drive way. But it takes a few minutes. I also had the
head gasket done about a month ago. It hovers around 210, but slowly
goes up to 235, 240 or so and then comes back down. It doesn't over
heat. My heat works great. I drive 40 miles to work one way in it. I
have 31 inch tires. When I arrive at work I notice no sounds related to
overheating like hissing or burping. Would the temp fluctuate up and
down or could it be my gauge acting up?? It concerns me a little. My
fan clutch is operating properly. I'm confused!!!!!
Thanks
Greg
95 YJ 4.0
Mike Romain wrote:
> That sounds within the normal range. My 258 runs right around there
> too.
>
> The faster you go, the more heat you create and energy you use. On a
> hot summer day, I get borderline overheating and cap burps when I try to
> go over 70 mph for any extended time. That is due to my winch and
> lights interfering with the flow to the rad.
>
> How's the oil level? I find mine runs a bit hotter when low a quart of
> oil or when in need of a change.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
> jerryg wrote:
> >
> > Good evening all. I have appeared here before with a erratic temp
> > gauge. After confirming that the engine block is not plugged, having a
> > new correct flow water pump installed, a recent radiator, new
> > thermostat, twice this week, and this evening a new temp sending unit,
> > my gauge still will not sit at 210. The old sending unit was corroded,
> > and fell apart when I removed it. I knew it was bad. The gauge used to
> > flucuate between 210 and 260. Up and down constantly. Now it goes up
> > and down between 210 and 235. When I first start it and let it warm up,
> > it hangs around 210, and when I start driving, it begins to move. Why.
> >
> > Thanks,
> >
> > Greg
sitting in the drive way. But it takes a few minutes. I also had the
head gasket done about a month ago. It hovers around 210, but slowly
goes up to 235, 240 or so and then comes back down. It doesn't over
heat. My heat works great. I drive 40 miles to work one way in it. I
have 31 inch tires. When I arrive at work I notice no sounds related to
overheating like hissing or burping. Would the temp fluctuate up and
down or could it be my gauge acting up?? It concerns me a little. My
fan clutch is operating properly. I'm confused!!!!!
Thanks
Greg
95 YJ 4.0
Mike Romain wrote:
> That sounds within the normal range. My 258 runs right around there
> too.
>
> The faster you go, the more heat you create and energy you use. On a
> hot summer day, I get borderline overheating and cap burps when I try to
> go over 70 mph for any extended time. That is due to my winch and
> lights interfering with the flow to the rad.
>
> How's the oil level? I find mine runs a bit hotter when low a quart of
> oil or when in need of a change.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
> jerryg wrote:
> >
> > Good evening all. I have appeared here before with a erratic temp
> > gauge. After confirming that the engine block is not plugged, having a
> > new correct flow water pump installed, a recent radiator, new
> > thermostat, twice this week, and this evening a new temp sending unit,
> > my gauge still will not sit at 210. The old sending unit was corroded,
> > and fell apart when I removed it. I knew it was bad. The gauge used to
> > flucuate between 210 and 260. Up and down constantly. Now it goes up
> > and down between 210 and 235. When I first start it and let it warm up,
> > it hangs around 210, and when I start driving, it begins to move. Why.
> >
> > Thanks,
> >
> > Greg
12-26-2006, 09:20 PM
#6
Guest
Posts: n/a
Re: Erratic temp guage
Hi Mike, Well I just changed the oil. And It starts moving on me while
sitting in the drive way. But it takes a few minutes. I also had the
head gasket done about a month ago. It hovers around 210, but slowly
goes up to 235, 240 or so and then comes back down. It doesn't over
heat. My heat works great. I drive 40 miles to work one way in it. I
have 31 inch tires. When I arrive at work I notice no sounds related to
overheating like hissing or burping. Would the temp fluctuate up and
down or could it be my gauge acting up?? It concerns me a little. My
fan clutch is operating properly. I'm confused!!!!!
Thanks
Greg
95 YJ 4.0
Mike Romain wrote:
> That sounds within the normal range. My 258 runs right around there
> too.
>
> The faster you go, the more heat you create and energy you use. On a
> hot summer day, I get borderline overheating and cap burps when I try to
> go over 70 mph for any extended time. That is due to my winch and
> lights interfering with the flow to the rad.
>
> How's the oil level? I find mine runs a bit hotter when low a quart of
> oil or when in need of a change.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
> jerryg wrote:
> >
> > Good evening all. I have appeared here before with a erratic temp
> > gauge. After confirming that the engine block is not plugged, having a
> > new correct flow water pump installed, a recent radiator, new
> > thermostat, twice this week, and this evening a new temp sending unit,
> > my gauge still will not sit at 210. The old sending unit was corroded,
> > and fell apart when I removed it. I knew it was bad. The gauge used to
> > flucuate between 210 and 260. Up and down constantly. Now it goes up
> > and down between 210 and 235. When I first start it and let it warm up,
> > it hangs around 210, and when I start driving, it begins to move. Why.
> >
> > Thanks,
> >
> > Greg
sitting in the drive way. But it takes a few minutes. I also had the
head gasket done about a month ago. It hovers around 210, but slowly
goes up to 235, 240 or so and then comes back down. It doesn't over
heat. My heat works great. I drive 40 miles to work one way in it. I
have 31 inch tires. When I arrive at work I notice no sounds related to
overheating like hissing or burping. Would the temp fluctuate up and
down or could it be my gauge acting up?? It concerns me a little. My
fan clutch is operating properly. I'm confused!!!!!
Thanks
Greg
95 YJ 4.0
Mike Romain wrote:
> That sounds within the normal range. My 258 runs right around there
> too.
>
> The faster you go, the more heat you create and energy you use. On a
> hot summer day, I get borderline overheating and cap burps when I try to
> go over 70 mph for any extended time. That is due to my winch and
> lights interfering with the flow to the rad.
>
> How's the oil level? I find mine runs a bit hotter when low a quart of
> oil or when in need of a change.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
> jerryg wrote:
> >
> > Good evening all. I have appeared here before with a erratic temp
> > gauge. After confirming that the engine block is not plugged, having a
> > new correct flow water pump installed, a recent radiator, new
> > thermostat, twice this week, and this evening a new temp sending unit,
> > my gauge still will not sit at 210. The old sending unit was corroded,
> > and fell apart when I removed it. I knew it was bad. The gauge used to
> > flucuate between 210 and 260. Up and down constantly. Now it goes up
> > and down between 210 and 235. When I first start it and let it warm up,
> > it hangs around 210, and when I start driving, it begins to move. Why.
> >
> > Thanks,
> >
> > Greg
12-26-2006, 09:20 PM
#7
Guest
Posts: n/a
Re: Erratic temp guage
Hi Mike, Well I just changed the oil. And It starts moving on me while
sitting in the drive way. But it takes a few minutes. I also had the
head gasket done about a month ago. It hovers around 210, but slowly
goes up to 235, 240 or so and then comes back down. It doesn't over
heat. My heat works great. I drive 40 miles to work one way in it. I
have 31 inch tires. When I arrive at work I notice no sounds related to
overheating like hissing or burping. Would the temp fluctuate up and
down or could it be my gauge acting up?? It concerns me a little. My
fan clutch is operating properly. I'm confused!!!!!
Thanks
Greg
95 YJ 4.0
Mike Romain wrote:
> That sounds within the normal range. My 258 runs right around there
> too.
>
> The faster you go, the more heat you create and energy you use. On a
> hot summer day, I get borderline overheating and cap burps when I try to
> go over 70 mph for any extended time. That is due to my winch and
> lights interfering with the flow to the rad.
>
> How's the oil level? I find mine runs a bit hotter when low a quart of
> oil or when in need of a change.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
> jerryg wrote:
> >
> > Good evening all. I have appeared here before with a erratic temp
> > gauge. After confirming that the engine block is not plugged, having a
> > new correct flow water pump installed, a recent radiator, new
> > thermostat, twice this week, and this evening a new temp sending unit,
> > my gauge still will not sit at 210. The old sending unit was corroded,
> > and fell apart when I removed it. I knew it was bad. The gauge used to
> > flucuate between 210 and 260. Up and down constantly. Now it goes up
> > and down between 210 and 235. When I first start it and let it warm up,
> > it hangs around 210, and when I start driving, it begins to move. Why.
> >
> > Thanks,
> >
> > Greg
sitting in the drive way. But it takes a few minutes. I also had the
head gasket done about a month ago. It hovers around 210, but slowly
goes up to 235, 240 or so and then comes back down. It doesn't over
heat. My heat works great. I drive 40 miles to work one way in it. I
have 31 inch tires. When I arrive at work I notice no sounds related to
overheating like hissing or burping. Would the temp fluctuate up and
down or could it be my gauge acting up?? It concerns me a little. My
fan clutch is operating properly. I'm confused!!!!!
Thanks
Greg
95 YJ 4.0
Mike Romain wrote:
> That sounds within the normal range. My 258 runs right around there
> too.
>
> The faster you go, the more heat you create and energy you use. On a
> hot summer day, I get borderline overheating and cap burps when I try to
> go over 70 mph for any extended time. That is due to my winch and
> lights interfering with the flow to the rad.
>
> How's the oil level? I find mine runs a bit hotter when low a quart of
> oil or when in need of a change.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
> jerryg wrote:
> >
> > Good evening all. I have appeared here before with a erratic temp
> > gauge. After confirming that the engine block is not plugged, having a
> > new correct flow water pump installed, a recent radiator, new
> > thermostat, twice this week, and this evening a new temp sending unit,
> > my gauge still will not sit at 210. The old sending unit was corroded,
> > and fell apart when I removed it. I knew it was bad. The gauge used to
> > flucuate between 210 and 260. Up and down constantly. Now it goes up
> > and down between 210 and 235. When I first start it and let it warm up,
> > it hangs around 210, and when I start driving, it begins to move. Why.
> >
> > Thanks,
> >
> > Greg
12-26-2006, 09:21 PM
#8
Guest
Posts: n/a
Re: Erratic temp guage
On 26 Dec 2006 17:00:54 -0800, "jerryg" <Gregginn7@msn.com> wrote:
>Good evening all. I have appeared here before with a erratic temp
>gauge. After confirming that the engine block is not plugged, having a
>new correct flow water pump installed, a recent radiator, new
>thermostat, twice this week, and this evening a new temp sending unit,
>my gauge still will not sit at 210. The old sending unit was corroded,
>and fell apart when I removed it. I knew it was bad. The gauge used to
>flucuate between 210 and 260. Up and down constantly. Now it goes up
>and down between 210 and 235. When I first start it and let it warm up,
>it hangs around 210, and when I start driving, it begins to move. Why.
>
What model is it? I had a similar problem on my '77 Cherokee (195
degree thermostat). In town, summer or winter, A/C or not, gauge read
at the lower end of the green zone (195 or so). At higher speeds, it
would run higher. In summer, with the A/C on and driving on the
freeway, it would run near the end of the green range (but not
actually overheat). It didn't used to get that hot unless I was
towing down a crowded highway in hot midday sun. I replaced the
radiator with an identical Modine (stock), when the old one finally
quit. Same song, second verse. When that one quit last summer, I did
the obvious fix-a radiator with one more row of tubes (from three rows
to four-doubles cooling capacity-it's a direct square relationship).
Still runs hotter at high speed (the engine has to work harder), but
only slightly. Problem solved, and -DUH- it finally dawned on me-it
was made for the then national speed limit of 55 mph (and the radiator
size was not increased when full-time-four-wheel-drive (Quadratrac)
was introduced back in the '70's (it has no two-wheel-drive capability
at all). At 65-70+, ram air is no longer sufficient for the extra
load placed on any engine, and more cooling is required. But I do now
have a piece of cardboard covering about half the radiator during cold
weather to help it heat up better. Especially since it's only a
6-minute drive to work. An oversized radiator would definitely hold
your temperature down. Hope this helps.
Dan
>Thanks,
>
>Greg
>Good evening all. I have appeared here before with a erratic temp
>gauge. After confirming that the engine block is not plugged, having a
>new correct flow water pump installed, a recent radiator, new
>thermostat, twice this week, and this evening a new temp sending unit,
>my gauge still will not sit at 210. The old sending unit was corroded,
>and fell apart when I removed it. I knew it was bad. The gauge used to
>flucuate between 210 and 260. Up and down constantly. Now it goes up
>and down between 210 and 235. When I first start it and let it warm up,
>it hangs around 210, and when I start driving, it begins to move. Why.
>
What model is it? I had a similar problem on my '77 Cherokee (195
degree thermostat). In town, summer or winter, A/C or not, gauge read
at the lower end of the green zone (195 or so). At higher speeds, it
would run higher. In summer, with the A/C on and driving on the
freeway, it would run near the end of the green range (but not
actually overheat). It didn't used to get that hot unless I was
towing down a crowded highway in hot midday sun. I replaced the
radiator with an identical Modine (stock), when the old one finally
quit. Same song, second verse. When that one quit last summer, I did
the obvious fix-a radiator with one more row of tubes (from three rows
to four-doubles cooling capacity-it's a direct square relationship).
Still runs hotter at high speed (the engine has to work harder), but
only slightly. Problem solved, and -DUH- it finally dawned on me-it
was made for the then national speed limit of 55 mph (and the radiator
size was not increased when full-time-four-wheel-drive (Quadratrac)
was introduced back in the '70's (it has no two-wheel-drive capability
at all). At 65-70+, ram air is no longer sufficient for the extra
load placed on any engine, and more cooling is required. But I do now
have a piece of cardboard covering about half the radiator during cold
weather to help it heat up better. Especially since it's only a
6-minute drive to work. An oversized radiator would definitely hold
your temperature down. Hope this helps.
Dan
>Thanks,
>
>Greg
12-26-2006, 09:21 PM
#9
Guest
Posts: n/a
Re: Erratic temp guage
On 26 Dec 2006 17:00:54 -0800, "jerryg" <Gregginn7@msn.com> wrote:
>Good evening all. I have appeared here before with a erratic temp
>gauge. After confirming that the engine block is not plugged, having a
>new correct flow water pump installed, a recent radiator, new
>thermostat, twice this week, and this evening a new temp sending unit,
>my gauge still will not sit at 210. The old sending unit was corroded,
>and fell apart when I removed it. I knew it was bad. The gauge used to
>flucuate between 210 and 260. Up and down constantly. Now it goes up
>and down between 210 and 235. When I first start it and let it warm up,
>it hangs around 210, and when I start driving, it begins to move. Why.
>
What model is it? I had a similar problem on my '77 Cherokee (195
degree thermostat). In town, summer or winter, A/C or not, gauge read
at the lower end of the green zone (195 or so). At higher speeds, it
would run higher. In summer, with the A/C on and driving on the
freeway, it would run near the end of the green range (but not
actually overheat). It didn't used to get that hot unless I was
towing down a crowded highway in hot midday sun. I replaced the
radiator with an identical Modine (stock), when the old one finally
quit. Same song, second verse. When that one quit last summer, I did
the obvious fix-a radiator with one more row of tubes (from three rows
to four-doubles cooling capacity-it's a direct square relationship).
Still runs hotter at high speed (the engine has to work harder), but
only slightly. Problem solved, and -DUH- it finally dawned on me-it
was made for the then national speed limit of 55 mph (and the radiator
size was not increased when full-time-four-wheel-drive (Quadratrac)
was introduced back in the '70's (it has no two-wheel-drive capability
at all). At 65-70+, ram air is no longer sufficient for the extra
load placed on any engine, and more cooling is required. But I do now
have a piece of cardboard covering about half the radiator during cold
weather to help it heat up better. Especially since it's only a
6-minute drive to work. An oversized radiator would definitely hold
your temperature down. Hope this helps.
Dan
>Thanks,
>
>Greg
>Good evening all. I have appeared here before with a erratic temp
>gauge. After confirming that the engine block is not plugged, having a
>new correct flow water pump installed, a recent radiator, new
>thermostat, twice this week, and this evening a new temp sending unit,
>my gauge still will not sit at 210. The old sending unit was corroded,
>and fell apart when I removed it. I knew it was bad. The gauge used to
>flucuate between 210 and 260. Up and down constantly. Now it goes up
>and down between 210 and 235. When I first start it and let it warm up,
>it hangs around 210, and when I start driving, it begins to move. Why.
>
What model is it? I had a similar problem on my '77 Cherokee (195
degree thermostat). In town, summer or winter, A/C or not, gauge read
at the lower end of the green zone (195 or so). At higher speeds, it
would run higher. In summer, with the A/C on and driving on the
freeway, it would run near the end of the green range (but not
actually overheat). It didn't used to get that hot unless I was
towing down a crowded highway in hot midday sun. I replaced the
radiator with an identical Modine (stock), when the old one finally
quit. Same song, second verse. When that one quit last summer, I did
the obvious fix-a radiator with one more row of tubes (from three rows
to four-doubles cooling capacity-it's a direct square relationship).
Still runs hotter at high speed (the engine has to work harder), but
only slightly. Problem solved, and -DUH- it finally dawned on me-it
was made for the then national speed limit of 55 mph (and the radiator
size was not increased when full-time-four-wheel-drive (Quadratrac)
was introduced back in the '70's (it has no two-wheel-drive capability
at all). At 65-70+, ram air is no longer sufficient for the extra
load placed on any engine, and more cooling is required. But I do now
have a piece of cardboard covering about half the radiator during cold
weather to help it heat up better. Especially since it's only a
6-minute drive to work. An oversized radiator would definitely hold
your temperature down. Hope this helps.
Dan
>Thanks,
>
>Greg
12-26-2006, 09:21 PM
#10
Guest
Posts: n/a
Re: Erratic temp guage
On 26 Dec 2006 17:00:54 -0800, "jerryg" <Gregginn7@msn.com> wrote:
>Good evening all. I have appeared here before with a erratic temp
>gauge. After confirming that the engine block is not plugged, having a
>new correct flow water pump installed, a recent radiator, new
>thermostat, twice this week, and this evening a new temp sending unit,
>my gauge still will not sit at 210. The old sending unit was corroded,
>and fell apart when I removed it. I knew it was bad. The gauge used to
>flucuate between 210 and 260. Up and down constantly. Now it goes up
>and down between 210 and 235. When I first start it and let it warm up,
>it hangs around 210, and when I start driving, it begins to move. Why.
>
What model is it? I had a similar problem on my '77 Cherokee (195
degree thermostat). In town, summer or winter, A/C or not, gauge read
at the lower end of the green zone (195 or so). At higher speeds, it
would run higher. In summer, with the A/C on and driving on the
freeway, it would run near the end of the green range (but not
actually overheat). It didn't used to get that hot unless I was
towing down a crowded highway in hot midday sun. I replaced the
radiator with an identical Modine (stock), when the old one finally
quit. Same song, second verse. When that one quit last summer, I did
the obvious fix-a radiator with one more row of tubes (from three rows
to four-doubles cooling capacity-it's a direct square relationship).
Still runs hotter at high speed (the engine has to work harder), but
only slightly. Problem solved, and -DUH- it finally dawned on me-it
was made for the then national speed limit of 55 mph (and the radiator
size was not increased when full-time-four-wheel-drive (Quadratrac)
was introduced back in the '70's (it has no two-wheel-drive capability
at all). At 65-70+, ram air is no longer sufficient for the extra
load placed on any engine, and more cooling is required. But I do now
have a piece of cardboard covering about half the radiator during cold
weather to help it heat up better. Especially since it's only a
6-minute drive to work. An oversized radiator would definitely hold
your temperature down. Hope this helps.
Dan
>Thanks,
>
>Greg
>Good evening all. I have appeared here before with a erratic temp
>gauge. After confirming that the engine block is not plugged, having a
>new correct flow water pump installed, a recent radiator, new
>thermostat, twice this week, and this evening a new temp sending unit,
>my gauge still will not sit at 210. The old sending unit was corroded,
>and fell apart when I removed it. I knew it was bad. The gauge used to
>flucuate between 210 and 260. Up and down constantly. Now it goes up
>and down between 210 and 235. When I first start it and let it warm up,
>it hangs around 210, and when I start driving, it begins to move. Why.
>
What model is it? I had a similar problem on my '77 Cherokee (195
degree thermostat). In town, summer or winter, A/C or not, gauge read
at the lower end of the green zone (195 or so). At higher speeds, it
would run higher. In summer, with the A/C on and driving on the
freeway, it would run near the end of the green range (but not
actually overheat). It didn't used to get that hot unless I was
towing down a crowded highway in hot midday sun. I replaced the
radiator with an identical Modine (stock), when the old one finally
quit. Same song, second verse. When that one quit last summer, I did
the obvious fix-a radiator with one more row of tubes (from three rows
to four-doubles cooling capacity-it's a direct square relationship).
Still runs hotter at high speed (the engine has to work harder), but
only slightly. Problem solved, and -DUH- it finally dawned on me-it
was made for the then national speed limit of 55 mph (and the radiator
size was not increased when full-time-four-wheel-drive (Quadratrac)
was introduced back in the '70's (it has no two-wheel-drive capability
at all). At 65-70+, ram air is no longer sufficient for the extra
load placed on any engine, and more cooling is required. But I do now
have a piece of cardboard covering about half the radiator during cold
weather to help it heat up better. Especially since it's only a
6-minute drive to work. An oversized radiator would definitely hold
your temperature down. Hope this helps.
Dan
>Thanks,
>
>Greg
