A/C Compressor Not Cycling - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 05-31-2006, 10:08 AM   #1
Junior Member
Posts like a V-Tak
Thread Starter
 
Join Date: Feb 2003
Location: Alliance, Ohio
Posts: 25
Thanks: 0
Thanked 0 Times in 0 Posts
Bob Keyes is on a distinguished road
Default A/C Compressor Not Cycling

Hi all, I have a couple of questions with my 97 SSE (with electronic climate control):
I hit my AC button last Saturday and got no cold air. Last night I was working on it and I found a lot of usefull information here in this forum but not enough to correct my problem yet. Comressor is free, R134a is at about 35# (according to my fill kit that is ok) but the compressor will not cycle. How do you jump the pressure switch? There are 3 wires: blk, red and tan. I swapped the relay and fuse in the maxi fuse center and still nothing. I also tried tapping on the compressor clutch. Any other things to check?
Bob Keyes is offline   Reply With Quote
Old 05-31-2006, 10:35 AM   #2
Senior Member
True Car Nut
 
Join Date: Oct 2005
Location: Central Florida
Posts: 7,030
Thanks: 0
Thanked 0 Times in 0 Posts
lash is on a distinguished road
Default

Bob, I'm going to have to do a little research on this tonight before I can give you an intelligent answer. Maybe before then, someone else will pipe up.
lash is offline   Reply With Quote
Old 05-31-2006, 10:36 AM   #3
Senior Member
Posts like a Turbo
 
Join Date: Mar 2006
Location: Houston, Tx
Posts: 367
Thanks: 0
Thanked 0 Times in 0 Posts
BonnevillesSince62 is on a distinguished road
Default

If the compressor won't come on at all, your pressure reading is invalid. I'd have a can of r134 ready (maybe 2), and figure out how to jump the switch. I haven't looked at my Bonnie, but I've never seen one with more than 2 wires.
BonnevillesSince62 is offline   Reply With Quote
Old 05-31-2006, 12:04 PM   #4
Junior Member
Posts like a V-Tak
Thread Starter
 
Join Date: Feb 2003
Location: Alliance, Ohio
Posts: 25
Thanks: 0
Thanked 0 Times in 0 Posts
Bob Keyes is on a distinguished road
Default

The switch I am looking at is the one right behind one of the cooling fans and right below the exhaust manifold. There are definetely 3 wires. Maybe I am looking at the wrong thing?????
Bob Keyes is offline   Reply With Quote
Old 05-31-2006, 12:07 PM   #5
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Don't jump it...I think you might not have the right pressure yet. I remember looking it up last year and finding it was quite different than the "expected" on kits.

Lash..do you have your manual handy to check the required pressure?
BillBoost37 is offline   Reply With Quote
Old 05-31-2006, 12:59 PM   #6
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

I believe at 35 PSI the compressor should cycle on and off frequently... But againg it may require more pressure... The Low sid may start out at 90-100 Psi, as soon at the compressor turns on that pressure should fall to the acceptable range...

I gave mine a shot yesterday as it was cycling on and off in hot weather... I noticed it was low, A charge resolved that problem...

Now for you guys with the ECC how does the system work?

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
Old 05-31-2006, 03:16 PM   #7
Senior Member
True Car Nut
 
Join Date: Oct 2005
Location: Central Florida
Posts: 7,030
Thanks: 0
Thanked 0 Times in 0 Posts
lash is on a distinguished road
Default

Quote:
Originally Posted by BillBoost37
Don't jump it...I think you might not have the right pressure yet. I remember looking it up last year and finding it was quite different than the "expected" on kits.

Lash..do you have your manual handy to check the required pressure?
Don't have mine on me today, thus my comment above, lol.

i'll take a look at it tonight and try to help a little.
lash is offline   Reply With Quote
Old 06-01-2006, 01:15 AM   #8
Senior Member
Posts like a Supercharger
 
Join Date: Mar 2006
Location: Chicago
Posts: 193
Thanks: 0
Thanked 0 Times in 0 Posts
BlownBuick is on a distinguished road
Default

I know in your car the compressor shouldn't cycle. It'* variable displacement and will only pump less instead of cycling the clutch on and off. You could very well be low on R-134a. The only way to tell is to have the system completely evacuated and recharged with the correct amount of freon to know for sure that it'* charged properly. Plus, the accuracy of your gauge is questionable, and even 10 psi is a make or break differeance in A/C systems.
BlownBuick is offline   Reply With Quote
Old 06-01-2006, 05:12 AM   #9
Senior Member
True Car Nut
 
Join Date: Mar 2004
Location: Ames, Iowa
Posts: 3,066
Thanks: 0
Thanked 1 Time in 1 Post
bill buttermore is on a distinguished road
Default

If yours is like my '95, or older models, the low pressure switch is on the accumulator, up against the firewall. I have jumped that to check the function of the compressor clutch when the charge was too low to allow the compressor to kick in. I would not mess with the switch on the compressor, I believe that will be the high pressure switch.
bill buttermore is offline   Reply With Quote
Old 06-01-2006, 04:07 PM   #10
Junior Member
Posts like a V-Tak
Thread Starter
 
Join Date: Feb 2003
Location: Alliance, Ohio
Posts: 25
Thanks: 0
Thanked 0 Times in 0 Posts
Bob Keyes is on a distinguished road
Default

I just went out and pulled that maxi fuse / relay cover off again so I could clearly view the accumulator. There are no switches of any kind around it. The one that is behind the left cooling fan ,(standing in front of the car), with 3 wires, is in the line coming out of the high pressure side of the compressor. There is about 2 inches of line, the switch, a little expansion tank and the the line that runs into the condensor. Last night I pulled off the connector at the compressor clutch to see if I had any voltage there......and I do not. I have seen other posts talking about the pcm not commanding the AC on. What does this mean? If I have my system scanned will it tell me anything about the AC? I have had no SES light on.
Bob Keyes is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
A/C compressor cycling. Timothy's Buick Everything Electrical & Electronic 1 01-28-2010 08:09 AM
A/C Low Pressure Cycling Switch dandyd Everything Electrical & Electronic 2 07-25-2007 03:28 PM
No Cooling Fans and AC not Cycling coopsse 1992-1999 6 01-12-2007 01:14 PM
A/C Compressor Cycling 95 w. manual climate control Woosch 1992-1999 5 07-14-2006 06:50 PM
AC COMPRESSOR OR AC COMPRESSOR PULLEY LT 1992-1999 2 05-30-2006 02:44 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 05:44 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.