Search | Car Forums | Gallery | Articles | Helper | AF 350Z | IgorSushko.com | Corporate |
| Latest | 0 Rplys |
|
Show Printable Version | Email this Page | Subscribe to this Thread |
|
Thread Tools |
09-11-2014, 06:47 AM | #1 | |
AF Newbie
Join Date: Sep 2014
Location: Jasper, Georgia
Posts: 2
Thanks: 4
Thanked 0 Times in 0 Posts
|
96 Silverado Z71 no AC
I'm working through a series of electrical issues with this truck, none of which have (so far) been major. I'm hoping that someone can give me some guidance on the AC not working.
The blower runs on all three speeds, I can adjust the heat to warmer of cooler, and the floor, dash and defrost modes seem to work fine. The problem is that I don't have any lights on either the AC or Recirculation switches on the climate control module. I had lights at one time, but the compressor hasn't run since I've owned the truck. I'm not educated on how the AC should work on this truck, what the power flow is to activate the compressor, or what the common problems with the AC are. Any help to troubleshoot this and get the AC working as it should would be much appreciated! |
|
09-11-2014, 08:07 AM | #2 | |
AF Enthusiast
Join Date: Jul 2005
Location: troy, Ohio
Posts: 2,311
Thanks: 2
Thanked 171 Times in 169 Posts
|
Re: 96 Silverado Z71 no AC
Put a guage on a/c you need pressure to activate it- at least 47 psi- mostcommon failure is loss of refrigerant due to a belly leaker compressor.
__________________
Automotive A/C Engineer with: '99 IH 4700 Toy Hauler (2) '95 GEO Prizms both maroon '99 GMC Yukon '95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller. '94 Astro- 370k miles '94 Firebird Formula- 5.7L 180k miles- gone- '92 Chevy Lumina Van 3.8L 264k '86 GMC S-15 - 2.8L 154k '87 Buick Park Ave . 187k '86 Buick Park Ave 3.8L 199k miles- gone '77 Chevy Vega- 2.5L 175k miles gone but not forgotten '68 Camaro 396 4 spd RS/SS -72k miles- |
|
The Following User Says Thank You to brcidd For This Useful Post: |
OldGuy96 (09-15-2014)
|
09-11-2014, 06:37 PM | #3 | ||
AF Fanatic
Join Date: Oct 2007
Location: EVERETT, Massachusetts
Posts: 10,898
Thanks: 8
Thanked 432 Times in 431 Posts
|
Re: 96 Silverado Z71 no AC
Quote:
on the refrigerant tank passenger side is a switch. this is what stops the compressor from working when the refrigerant is too low like less than 5-10 psi. this is called the low pressure cutout switch. this is used in most all ac systems to prevent compressor damage. I would have an ac person see if it is empty , find the leak, and if you have some money fix it.. if compressor is the leak issue get a scrap yard one cheap.. |
||
The Following User Says Thank You to j cAT For This Useful Post: |
OldGuy96 (09-15-2014)
|
09-13-2014, 06:10 AM | #4 | |
AF Newbie
Thread starter
Join Date: Sep 2014
Location: Jasper, Georgia
Posts: 2
Thanks: 4
Thanked 0 Times in 0 Posts
|
Re: 96 Silverado Z71 no AC
I'll check on the compressor leak. I understand that the compressors on this model tend to leak around the middle joint.
Do compressors from newer models fit this system, and if so, what years should I be looking for? |
|
09-13-2014, 07:09 AM | #5 | ||
AF Fanatic
Join Date: Oct 2007
Location: EVERETT, Massachusetts
Posts: 10,898
Thanks: 8
Thanked 432 Times in 431 Posts
|
Re: 96 Silverado Z71 no AC
Quote:
GM mounted the ac compressor at the low point of the ac system this causes compressor failures ..when the compressors where mounted up high these lasted for decades with no problems... what testing has been done ? |
||
The Following User Says Thank You to j cAT For This Useful Post: |
OldGuy96 (09-15-2014)
|
09-14-2014, 10:18 AM | #6 | |
AF Fanatic
Join Date: Jul 2011
Location: Worcester, Massachusetts
Posts: 5,017
Thanks: 70
Thanked 618 Times in 610 Posts
|
Re: 96 Silverado Z71 no AC
First, get gauges on this to see the pressure.....should equal ambient air on a cold engine....ambient air 80F, the lo=hi pressure with system of should be 80 psi.....
If pressure is ok, turn ac on, remove two wire connector from switch on accumulator, and jumper the harness to see if the compressor comes on.... |
|
The Following User Says Thank You to Tech II For This Useful Post: |
OldGuy96 (09-15-2014)
|
|
POST REPLY TO THIS THREAD |
|
|