1997 GMC truck Z71 - air not cooling

jroberts312 · 05-15-2007, 10:09 AM

Need some advice. My compressor does not appear to be turning on. I checked the fuses and relay under hood. The AC button lights up when pressed but the compressor does nothing. Is it the clutch? Anything else to check. Any help would be appreciated.

75K30 · 05-15-2007, 11:22 AM

Welcome;
Could very well be the system is low on refrigerant. If the system is low, it will not allow the compressor to activate through the switch. It is a failsafe device that prvents damage if the system becomes low, or empty.

jroberts312 · 05-15-2007, 11:29 AM

If the compressor will not turn on can you still send the freon? Doesn't the compressor suck in the freon? Thanks for your help.

75K30 · 05-15-2007, 11:37 AM

The pressure switch will keep it from turning on altogether. The switch is located in line before the compressor. The pressure in the can will allow the switch to change state, (close), and then the compressor will turn on.

72'CaminoKid · 05-15-2007, 01:45 PM

the mid-late model GMC's all have A?C problems to my knowledge, just know sure exaclty what the fix's were. odds are you're low on freon but i dont know where to tell you to check for a leak

gmctrucks · 05-24-2007, 02:15 AM

Can't one still use a paper clip to over ride it and see if compressor turns on at least my 87 Burb will work like that.

bradrhale · 05-25-2007, 02:10 PM

if you do use the paper clip trick, dont have the engine running. turn the key on but not start. you dont want to blow up your compressor if it is low on freon. gauges are nice to have for such dilemas.

05-15-2007, 10:09 AM	#1
jroberts312 Junior Member Join Date: May 2007 Posts: 2	1997 GMC truck Z71 - air not cooling Need some advice. My compressor does not appear to be turning on. I checked the fuses and relay under hood. The AC button lights up when pressed but the compressor does nothing. Is it the clutch? Anything else to check. Any help would be appreciated.

05-15-2007, 11:29 AM	#3
jroberts312 Junior Member Join Date: May 2007 Posts: 2	Ac If the compressor will not turn on can you still send the freon? Doesn't the compressor suck in the freon? Thanks for your help.

05-15-2007, 01:45 PM	#5
72'CaminoKid Senior Member Join Date: Jun 2005 Posts: 2,757	the mid-late model GMC's all have A?C problems to my knowledge, just know sure exaclty what the fix's were. odds are you're low on freon but i dont know where to tell you to check for a leak __________________ 99 suburban xlt 96 silverado 91 wrangler (my baby ) 08 Honday shadow 750 (my mistress)

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05-15-2007, 11:22 AM	#2
75K30 Senior Member Join Date: Jul 2006 Posts: 3,312	Welcome; Could very well be the system is low on refrigerant. If the system is low, it will not allow the compressor to activate through the switch. It is a failsafe device that prvents damage if the system becomes low, or empty.

05-15-2007, 11:37 AM	#4
75K30 Senior Member Join Date: Jul 2006 Posts: 3,312	The pressure switch will keep it from turning on altogether. The switch is located in line before the compressor. The pressure in the can will allow the switch to change state, (close), and then the compressor will turn on.

05-24-2007, 02:15 AM	#6
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,645	Can't one still use a paper clip to over ride it and see if compressor turns on at least my 87 Burb will work like that.

05-25-2007, 02:10 PM	#7
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 9,528	if you do use the paper clip trick, dont have the engine running. turn the key on but not start. you dont want to blow up your compressor if it is low on freon. gauges are nice to have for such dilemas.