cooling
05-21-2006, 05:57 PM
#1
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Join Date: May 2006
Location: lincoln, ne
Posts: 3
cooling
One of the fans on my 89 IROC does not come on, I think I got It narrowed down to the green wire with white where do I start tring to figure this out? And do the fans come on at different times?
05-21-2006, 06:20 PM
#2
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Join Date: Mar 2002
Location: Yelm, Wa USA
Posts: 2,446
Re: cooling
Originally Posted by mscott3
One of the fans on my 89 IROC does not come on, I think I got It narrowed down to the green wire with white where do I start tring to figure this out? And do the fans come on at different times?
05-21-2006, 06:29 PM
#4
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Join Date: Mar 2002
Location: Yelm, Wa USA
Posts: 2,446
Re: cooling
Originally Posted by mscott3
My ac dont work, so dont use it
The 2nd fan only will work when you turn on the AC so go out & turn it on & see if that fan turns on. even though it doesnt cool (which normally means that the freon (sp) is out) it should turn on that fan.
05-23-2006, 09:39 PM
#7
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Join Date: Sep 1999
Posts: 521
Re: cooling
Just to stop the confusion, the primary (1st fan) is the driver side fan and the secondary fan is the passenger side.
The primary fan comes on at 223F or when the A/C is on. People with aftermarket chips can have this programmed to turn on lower.
The secondary fan is controlled by the fan switch in the passenger cylinder head and by A/C head pressure. The stock switch turns the fan on at 235F. Aftermarket fan switches typically turn on the fan at 200 or 176. (I like the 200 myself). The fan will also turn on when the A/C head pressure is 233 psi or 1600 kPa. Since most of us don't have A/C pressure gauges, it's fairly safe to say that the pressure won't turn on the fan unless it's about 95F+ outside.
On a stock car with a good cooling system under decent weather conditions, the driver side fan will be all that is needed. By that time the thermostat is fully open and the one fan is typically enough. You have to idle for quite awhile in hot traffic to get the 2nd fan to turn on.
The primary fan comes on at 223F or when the A/C is on. People with aftermarket chips can have this programmed to turn on lower.
The secondary fan is controlled by the fan switch in the passenger cylinder head and by A/C head pressure. The stock switch turns the fan on at 235F. Aftermarket fan switches typically turn on the fan at 200 or 176. (I like the 200 myself). The fan will also turn on when the A/C head pressure is 233 psi or 1600 kPa. Since most of us don't have A/C pressure gauges, it's fairly safe to say that the pressure won't turn on the fan unless it's about 95F+ outside.
On a stock car with a good cooling system under decent weather conditions, the driver side fan will be all that is needed. By that time the thermostat is fully open and the one fan is typically enough. You have to idle for quite awhile in hot traffic to get the 2nd fan to turn on.
05-23-2006, 11:49 PM
#8
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Join Date: Jan 2006
Posts: 326
Re: cooling
stock fir the second fan is like 250*F
on 90 plus or map cars both are computer controlled,
usually mhen I burn chips I set them to come on at the same time, usually alot lower running temp then stock,
I've found that the big single fan on non A/C cars allows a lower running temp then dual fans, with a stock rad and water pump,
I run a 160 T-stat and I can get my car to run consitantly at 170-175,
where dual fan cars wont cool more then 180-185 with a 160 T-stat
on 90 plus or map cars both are computer controlled,
usually mhen I burn chips I set them to come on at the same time, usually alot lower running temp then stock,
I've found that the big single fan on non A/C cars allows a lower running temp then dual fans, with a stock rad and water pump,
I run a 160 T-stat and I can get my car to run consitantly at 170-175,
where dual fan cars wont cool more then 180-185 with a 160 T-stat
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