Re: Re: 2000 JGC V-8 overheating/ occasionally only !!
 

On Sun, 17 Dec 2006 19:22:04 -0800, Outatime <user@example.net> wrote:

>As I said earlier, I had this exact problem 10 years ago. It often ran
>very hot, other times it ran cool. As the OP mentioned, it runs hot
>after freeway driving, as mine did. Experience has taught me that a
>plugged radiator will not always run hot all of the time.


Clutch fan failures are a LOT more common than plugged raditors these
days. 15 years around I had a old plow truck start over heating one
day plowing snow for no reason when it had been doing fine for a few
years. It turned out it was the clutch fan because it was not cooling
properly with the disturbed air flow from plow in transport and engine
was over heating. Replaced clutch and all was well.
-----------------
TheSnoMan.com

Re: Re: 2000 JGC V-8 overheating/ occasionally only !!
 

On Sun, 17 Dec 2006 19:22:04 -0800, Outatime <user@example.net> wrote:

>As I said earlier, I had this exact problem 10 years ago. It often ran
>very hot, other times it ran cool. As the OP mentioned, it runs hot
>after freeway driving, as mine did. Experience has taught me that a
>plugged radiator will not always run hot all of the time.


Clutch fan failures are a LOT more common than plugged raditors these
days. 15 years around I had a old plow truck start over heating one
day plowing snow for no reason when it had been doing fine for a few
years. It turned out it was the clutch fan because it was not cooling
properly with the disturbed air flow from plow in transport and engine
was over heating. Replaced clutch and all was well.
-----------------
TheSnoMan.com

Re: Re: 2000 JGC V-8 overheating/ occasionally only !!
 

On Sun, 17 Dec 2006 19:22:04 -0800, Outatime <user@example.net> wrote:

>As I said earlier, I had this exact problem 10 years ago. It often ran
>very hot, other times it ran cool. As the OP mentioned, it runs hot
>after freeway driving, as mine did. Experience has taught me that a
>plugged radiator will not always run hot all of the time.


Clutch fan failures are a LOT more common than plugged raditors these
days. 15 years around I had a old plow truck start over heating one
day plowing snow for no reason when it had been doing fine for a few
years. It turned out it was the clutch fan because it was not cooling
properly with the disturbed air flow from plow in transport and engine
was over heating. Replaced clutch and all was well.
-----------------
TheSnoMan.com

Re: Re: 2000 JGC V-8 overheating/ occasionally only !!
 

The clutch fan would *seem to be* eliminated, because of the freeway only
overheating. But, and I don't have one of these vehicles, there is a lot of
equipment under the hood of a JGC V8, potentially blocking the air flow.
SnoMan could be right. Now in my Suburban I can drive all day long on the
freeway without any overheating, but GM left some room under the hood. ;^)

Earle

"SnoMan" <admin@snoman.com> wrote in message
news:26vco21092qt25e3eq808imelpc2u1iri9@4ax.com...
> On Sun, 17 Dec 2006 19:22:04 -0800, Outatime <user@example.net> wrote:
>
> >As I said earlier, I had this exact problem 10 years ago. It often ran
> >very hot, other times it ran cool. As the OP mentioned, it runs hot
> >after freeway driving, as mine did. Experience has taught me that a
> >plugged radiator will not always run hot all of the time.
>
>
> Clutch fan failures are a LOT more common than plugged raditors these
> days. 15 years around I had a old plow truck start over heating one
> day plowing snow for no reason when it had been doing fine for a few
> years. It turned out it was the clutch fan because it was not cooling
> properly with the disturbed air flow from plow in transport and engine
> was over heating. Replaced clutch and all was well.
> -----------------
> TheSnoMan.com

Re: Re: 2000 JGC V-8 overheating/ occasionally only !!
 

The clutch fan would *seem to be* eliminated, because of the freeway only
overheating. But, and I don't have one of these vehicles, there is a lot of
equipment under the hood of a JGC V8, potentially blocking the air flow.
SnoMan could be right. Now in my Suburban I can drive all day long on the
freeway without any overheating, but GM left some room under the hood. ;^)

Earle

"SnoMan" <admin@snoman.com> wrote in message
news:26vco21092qt25e3eq808imelpc2u1iri9@4ax.com...
> On Sun, 17 Dec 2006 19:22:04 -0800, Outatime <user@example.net> wrote:
>
> >As I said earlier, I had this exact problem 10 years ago. It often ran
> >very hot, other times it ran cool. As the OP mentioned, it runs hot
> >after freeway driving, as mine did. Experience has taught me that a
> >plugged radiator will not always run hot all of the time.
>
>
> Clutch fan failures are a LOT more common than plugged raditors these
> days. 15 years around I had a old plow truck start over heating one
> day plowing snow for no reason when it had been doing fine for a few
> years. It turned out it was the clutch fan because it was not cooling
> properly with the disturbed air flow from plow in transport and engine
> was over heating. Replaced clutch and all was well.
> -----------------
> TheSnoMan.com

Re: Re: 2000 JGC V-8 overheating/ occasionally only !!
 

The clutch fan would *seem to be* eliminated, because of the freeway only
overheating. But, and I don't have one of these vehicles, there is a lot of
equipment under the hood of a JGC V8, potentially blocking the air flow.
SnoMan could be right. Now in my Suburban I can drive all day long on the
freeway without any overheating, but GM left some room under the hood. ;^)

Earle

"SnoMan" <admin@snoman.com> wrote in message
news:26vco21092qt25e3eq808imelpc2u1iri9@4ax.com...
> On Sun, 17 Dec 2006 19:22:04 -0800, Outatime <user@example.net> wrote:
>
> >As I said earlier, I had this exact problem 10 years ago. It often ran
> >very hot, other times it ran cool. As the OP mentioned, it runs hot
> >after freeway driving, as mine did. Experience has taught me that a
> >plugged radiator will not always run hot all of the time.
>
>
> Clutch fan failures are a LOT more common than plugged raditors these
> days. 15 years around I had a old plow truck start over heating one
> day plowing snow for no reason when it had been doing fine for a few
> years. It turned out it was the clutch fan because it was not cooling
> properly with the disturbed air flow from plow in transport and engine
> was over heating. Replaced clutch and all was well.
> -----------------
> TheSnoMan.com

Re: Re: Re: 2000 JGC V-8 overheating/ occasionally only !!
 

On Mon, 18 Dec 2006 09:22:56 -0700, "Earle Horton"
<anglocapitalista@usa.com> wrote:

>The clutch fan would *seem to be* eliminated, because of the freeway only
>overheating. But, and I don't have one of these vehicles, there is a lot of
>equipment under the hood of a JGC V8, potentially blocking the air flow.
>SnoMan could be right. Now in my Suburban I can drive all day long on the
>freeway without any overheating, but GM left some room under the hood. ;^)


There is a misconception about clutch fans not providing any highway
cooling. Sometimes it is needed because ram air does not do the job.
On hot day i can hear the fan come in from time to time on my old
suburban and my 2000 K3500 even on highway. Because of this my temp
gage never exceeds 210 at any time and rarely even gets that high. I
will gladly have a like extra fan noise from time to time from a
agressive clutch fan that keep engine temps stable rather than a
conservative clutch fan setting that lets temps spike wildly before it
engages. I have had to "tweak" the clutch fan bimetal coil on my old
burb a few times due to it aging but it still the original one
otherwie after 17 years and over 180K miles.
-----------------
TheSnoMan.com

Re: Re: Re: 2000 JGC V-8 overheating/ occasionally only !!
 

On Mon, 18 Dec 2006 09:22:56 -0700, "Earle Horton"
<anglocapitalista@usa.com> wrote:

>The clutch fan would *seem to be* eliminated, because of the freeway only
>overheating. But, and I don't have one of these vehicles, there is a lot of
>equipment under the hood of a JGC V8, potentially blocking the air flow.
>SnoMan could be right. Now in my Suburban I can drive all day long on the
>freeway without any overheating, but GM left some room under the hood. ;^)


There is a misconception about clutch fans not providing any highway
cooling. Sometimes it is needed because ram air does not do the job.
On hot day i can hear the fan come in from time to time on my old
suburban and my 2000 K3500 even on highway. Because of this my temp
gage never exceeds 210 at any time and rarely even gets that high. I
will gladly have a like extra fan noise from time to time from a
agressive clutch fan that keep engine temps stable rather than a
conservative clutch fan setting that lets temps spike wildly before it
engages. I have had to "tweak" the clutch fan bimetal coil on my old
burb a few times due to it aging but it still the original one
otherwie after 17 years and over 180K miles.
-----------------
TheSnoMan.com

Re: Re: Re: 2000 JGC V-8 overheating/ occasionally only !!
 

On Mon, 18 Dec 2006 09:22:56 -0700, "Earle Horton"
<anglocapitalista@usa.com> wrote:

>The clutch fan would *seem to be* eliminated, because of the freeway only
>overheating. But, and I don't have one of these vehicles, there is a lot of
>equipment under the hood of a JGC V8, potentially blocking the air flow.
>SnoMan could be right. Now in my Suburban I can drive all day long on the
>freeway without any overheating, but GM left some room under the hood. ;^)


There is a misconception about clutch fans not providing any highway
cooling. Sometimes it is needed because ram air does not do the job.
On hot day i can hear the fan come in from time to time on my old
suburban and my 2000 K3500 even on highway. Because of this my temp
gage never exceeds 210 at any time and rarely even gets that high. I
will gladly have a like extra fan noise from time to time from a
agressive clutch fan that keep engine temps stable rather than a
conservative clutch fan setting that lets temps spike wildly before it
engages. I have had to "tweak" the clutch fan bimetal coil on my old
burb a few times due to it aging but it still the original one
otherwie after 17 years and over 180K miles.
-----------------
TheSnoMan.com

Re: 2000 JGC V-8 overheating/ occasionally only !!
 

SnoMan wrote:
>
> On Mon, 18 Dec 2006 09:22:56 -0700, "Earle Horton"
> <anglocapitalista@usa.com> wrote:
>
> >The clutch fan would *seem to be* eliminated, because of the freeway only
> >overheating. But, and I don't have one of these vehicles, there is a lot of
> >equipment under the hood of a JGC V8, potentially blocking the air flow.
> >SnoMan could be right. Now in my Suburban I can drive all day long on the
> >freeway without any overheating, but GM left some room under the hood. ;^)
>
> There is a misconception about clutch fans not providing any highway
> cooling. Sometimes it is needed because ram air does not do the job.
> On hot day i can hear the fan come in from time to time on my old
> suburban and my 2000 K3500 even on highway. Because of this my temp
> gage never exceeds 210 at any time and rarely even gets that high. I
> will gladly have a like extra fan noise from time to time from a
> agressive clutch fan that keep engine temps stable rather than a
> conservative clutch fan setting that lets temps spike wildly before it
> engages. I have had to "tweak" the clutch fan bimetal coil on my old
> burb a few times due to it aging but it still the original one
> otherwie after 17 years and over 180K miles.
> -----------------
> TheSnoMan.com

I will have to agree.

We put a new fan clutch into our Cherokee a few years ago and it
recently started overheating (red light on, no blow out) sometimes on
the highway, particularly on this one 20 mile uphill run.

So I check everything and then just because, stopped it with the light
on and tried to spin the fan. The sucker spun free!!!! It was a new
OEM one too.... Grr...

I am going to try that spring indexing, thanks for the write up.

I am almost tempted to index the spring for full on so the fan works all
the time...

The vehicle either sees a '5 minute to work drive' or a trip on the
highway.

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)