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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) |
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) |
Re: Re: 2000 JGC V-8 overheating/ occasionally only !!
On Mon, 18 Dec 2006 12:38:28 -0500, Mike Romain <romainm@sympatico.ca>
wrote: >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 Just remember, I little bit goes a long way with adjustments. I would suggest that you do not go from broke and figure on maybe having to remove it a time or two to get it just right. Try about 1/8 inch index cahnge for starters in your case and go from there. 1/4 inch is a very big adjustment here that may leave it engaged almost constantly at times. The weakness of the bimetal coiled clutch fan concept is that it reacts to the tempature of the air coming through radiator core not coolant so on a cool day it is possible to have it run hot and not have fan engage because the air is still not that hot because it started out cooler. WIth proper tweaking you can usually find a good compromise. ----------------- TheSnoMan.com |
Re: Re: 2000 JGC V-8 overheating/ occasionally only !!
On Mon, 18 Dec 2006 12:38:28 -0500, Mike Romain <romainm@sympatico.ca>
wrote: >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 Just remember, I little bit goes a long way with adjustments. I would suggest that you do not go from broke and figure on maybe having to remove it a time or two to get it just right. Try about 1/8 inch index cahnge for starters in your case and go from there. 1/4 inch is a very big adjustment here that may leave it engaged almost constantly at times. The weakness of the bimetal coiled clutch fan concept is that it reacts to the tempature of the air coming through radiator core not coolant so on a cool day it is possible to have it run hot and not have fan engage because the air is still not that hot because it started out cooler. WIth proper tweaking you can usually find a good compromise. ----------------- TheSnoMan.com |
Re: Re: 2000 JGC V-8 overheating/ occasionally only !!
On Mon, 18 Dec 2006 12:38:28 -0500, Mike Romain <romainm@sympatico.ca>
wrote: >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 Just remember, I little bit goes a long way with adjustments. I would suggest that you do not go from broke and figure on maybe having to remove it a time or two to get it just right. Try about 1/8 inch index cahnge for starters in your case and go from there. 1/4 inch is a very big adjustment here that may leave it engaged almost constantly at times. The weakness of the bimetal coiled clutch fan concept is that it reacts to the tempature of the air coming through radiator core not coolant so on a cool day it is possible to have it run hot and not have fan engage because the air is still not that hot because it started out cooler. WIth proper tweaking you can usually find a good compromise. ----------------- TheSnoMan.com |
Re: 2000 JGC V-8 overheating/ occasionally only !!
Holy Jeezus.
Do me a favor and either explain to me how a fan clutch will work properly with a plugged radiator (intermittently or not) and sort this out: "The weakness of the bimetal coiled clutch fan concept is that it reacts to the tempature of the air coming through radiator core not coolant so on a cool day it is possible to have it run hot and not have fan engage because the air is still not that hot because it started out cooler." ....or please stick to the Chevy Plow Forum. Jon |
Re: 2000 JGC V-8 overheating/ occasionally only !!
Holy Jeezus.
Do me a favor and either explain to me how a fan clutch will work properly with a plugged radiator (intermittently or not) and sort this out: "The weakness of the bimetal coiled clutch fan concept is that it reacts to the tempature of the air coming through radiator core not coolant so on a cool day it is possible to have it run hot and not have fan engage because the air is still not that hot because it started out cooler." ....or please stick to the Chevy Plow Forum. Jon |
Re: 2000 JGC V-8 overheating/ occasionally only !!
Holy Jeezus.
Do me a favor and either explain to me how a fan clutch will work properly with a plugged radiator (intermittently or not) and sort this out: "The weakness of the bimetal coiled clutch fan concept is that it reacts to the tempature of the air coming through radiator core not coolant so on a cool day it is possible to have it run hot and not have fan engage because the air is still not that hot because it started out cooler." ....or please stick to the Chevy Plow Forum. Jon |
Re: 2000 JGC V-8 overheating/ occasionally only !!
We actually sometimes have to block the air flow through the rad or the
engine won't heat up at all up here in The Great White North. You see tons of vehicle with cardboard over the rad or grill in the winter. I can see where an 'air' blocked rad will up the temperature the fan clutch sees and where a 'core' blocked rad will lower the temp the fan clutch 'should' see... All these anti pollution gizmos are based on an average, they don't work well in extremes. The fan clutch, the automatic choke, etc.... 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) Jon wrote: > > Holy Jeezus. > > Do me a favor and either explain to me how a fan clutch will work > properly with a plugged radiator (intermittently or not) and sort this > out: > > "The weakness of the bimetal coiled clutch fan concept is that it > reacts to the tempature of the air coming through radiator core not > coolant so on a cool day it is possible to have it run hot and not have > fan engage because the air is still not that hot because it > started out cooler." > > ...or please stick to the Chevy Plow Forum. > > Jon |
Re: 2000 JGC V-8 overheating/ occasionally only !!
We actually sometimes have to block the air flow through the rad or the
engine won't heat up at all up here in The Great White North. You see tons of vehicle with cardboard over the rad or grill in the winter. I can see where an 'air' blocked rad will up the temperature the fan clutch sees and where a 'core' blocked rad will lower the temp the fan clutch 'should' see... All these anti pollution gizmos are based on an average, they don't work well in extremes. The fan clutch, the automatic choke, etc.... 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) Jon wrote: > > Holy Jeezus. > > Do me a favor and either explain to me how a fan clutch will work > properly with a plugged radiator (intermittently or not) and sort this > out: > > "The weakness of the bimetal coiled clutch fan concept is that it > reacts to the tempature of the air coming through radiator core not > coolant so on a cool day it is possible to have it run hot and not have > fan engage because the air is still not that hot because it > started out cooler." > > ...or please stick to the Chevy Plow Forum. > > Jon |
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