jerryg

I guess what I'm trying to say is that it happens all the time, not
just at 55 mph.

Greg
jerryg wrote:
> 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

jerryg

I guess what I'm trying to say is that it happens all the time, not
just at 55 mph.

Greg
jerryg wrote:
> 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

jerryg

I guess what I'm trying to say is that it happens all the time, not
just at 55 mph.

Greg
jerryg wrote:
> 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

jerryg

Hey Dan, It does'nt run up to a hot temp and stay there, the gauge goes
up and down, constantly. I don't know how the fluid can change temp
like that so abruptly, that is if the new sending unit is working
properly.

Thanks,
Greg
Hootowl wrote:
> 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

jerryg

Hey Dan, It does'nt run up to a hot temp and stay there, the gauge goes
up and down, constantly. I don't know how the fluid can change temp
like that so abruptly, that is if the new sending unit is working
properly.

Thanks,
Greg
Hootowl wrote:
> 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

jerryg

Hey Dan, It does'nt run up to a hot temp and stay there, the gauge goes
up and down, constantly. I don't know how the fluid can change temp
like that so abruptly, that is if the new sending unit is working
properly.

Thanks,
Greg
Hootowl wrote:
> 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

jerryg

Just took a trip into town, around 15 miles round trip. Engine warmed
up fine. Heat was fine. Temp 210/235. Got home, lifted the hood, top
radiator hose hot, heater hose hot, bottom radiator hose not even warm.
Radiator warm top to bottom though!

Greg
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

jerryg

Just took a trip into town, around 15 miles round trip. Engine warmed
up fine. Heat was fine. Temp 210/235. Got home, lifted the hood, top
radiator hose hot, heater hose hot, bottom radiator hose not even warm.
Radiator warm top to bottom though!

Greg
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

jerryg

Just took a trip into town, around 15 miles round trip. Engine warmed
up fine. Heat was fine. Temp 210/235. Got home, lifted the hood, top
radiator hose hot, heater hose hot, bottom radiator hose not even warm.
Radiator warm top to bottom though!

Greg
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

Earle Horton

These gauges are usually of the bimetallic strip type. There is a mini
voltage regulator somewhere in the dash panel, that feeds them the correct
voltage. Ones I have seen look a little like a shrunken turn signal
flasher. The regulator itself could be the culprit, or it could be bad
voltage or ground to the instrument panel.

Saludos,

Earle

"jerryg" <Gregginn7@msn.com> wrote in message
news:1167186529.119005.197240@f1g2000cwa.googlegro ups.com...
> Hey Dan, It does'nt run up to a hot temp and stay there, the gauge goes
> up and down, constantly. I don't know how the fluid can change temp
> like that so abruptly, that is if the new sending unit is working
> properly.
>
> Thanks,
> Greg
> Hootowl wrote:
> > 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
>