AC Only Blows cold when driving.

cptcrnch · 09-14-2008, 10:27 AM

1999 SC1 Auto 130k. - Recently bought used.
My ac is only cold when driving above 30mph.
If I stop is goes warm ....FAST!!
Had my mechanic check it, says the system may have a plug in it somewhere. Coolant is NOT low.
Any other ideas b4 I have him start tearing the unit apart?
Thx!

Asterixx · 09-14-2008, 10:37 AM

Your two posts are related. The A/C is not working when stopped because the cooling fan is not forcing air through the condenser. When moving you're ramming air through. You need to fix the cooling fan.

fdryer · 09-14-2008, 11:14 AM

^ ^ What he said! ^ ^ ^

lovinparkville · 09-14-2008, 03:05 PM

The 2 things to check are the fan relay and the fan itself. The relay turns on at high heat (@220 degrees) or on AC on IF the system has R134 at a proper level (which you indicate the system is fine while moving), I'd look at the fan relay for sure as it's rarely used under normal driving.

09-14-2008, 10:27 AM	#1
cptcrnch Junior Member Join Date: Sep 2008 Location: Louisville KY Posts: 14 1999 SC1	AC Only Blows cold when driving. 1999 SC1 Auto 130k. - Recently bought used. My ac is only cold when driving above 30mph. If I stop is goes warm ....FAST!! Had my mechanic check it, says the system may have a plug in it somewhere. Coolant is NOT low. Any other ideas b4 I have him start tearing the unit apart? Thx!

09-14-2008, 10:37 AM	#2
Asterixx Member Join Date: Oct 2007 Location: Nova Scotia, Canada Posts: 216 1997 SL2 1996 SL1	Re: AC Only Blows cold when driving. Your two posts are related. The A/C is not working when stopped because the cooling fan is not forcing air through the condenser. When moving you're ramming air through. You need to fix the cooling fan. ... 1996 SL1 5m loaded except sunroof SOLD 1997 SL2 5m Loaded including sunroof, fog lights, and console bin. Et nunc, reges, intelligite, er udimini, qui judacati terram

09-14-2008, 11:14 AM	#3
fdryer Super Member Join Date: Jan 2006 Location: NYC Posts: 45,934 fdryer's Photos 2003 L-Series 3.0L Sedan	Re: AC Only Blows cold when driving. ^ ^ What he said! ^ ^ ^ ... VCX NANO

09-14-2008, 03:05 PM	#4
lovinparkville Junior Member Join Date: Sep 2008 Location: Missouri Posts: 13 2001 SW2	Re: AC Only Blows cold when driving. The 2 things to check are the fan relay and the fan itself. The relay turns on at high heat (@220 degrees) or on AC on IF the system has R134 at a proper level (which you indicate the system is fine while moving), I'd look at the fan relay for sure as it's rarely used under normal driving.

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