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Username Post: Need to identify a/c relays on '97 S10 LS        (Topic#216753)
ddunk1946 
Forum Newbie
Posts: 54
ddunk1946
Age: 68
Loc: Sugar Land, Texas
Reg: 01-17-08
05-12-09 06:11 AM - Post#1696179    

The compressor won't engage reliably but when it does, it blows cold. Am going to start with the easy stuff, e.g., replace the controling relays, check wiring (had a problem with the 4L60E trans last year that turned out to be wiring; no power to the solenoids; frayed wire), etc.

The relays I'm trying to replace are the a/c compressor relay and the a/c compressor control relay.

The shop manual shows 3 relays, but I have 4 and they all look the same. Haven't looked at them closely, (the last relay should be in today and I'll take a closer look at them) but the wiring bundles going into them seem color-coded; light green, beige, etc.

Any of this sound familiar? I appreciate any light anyone could shed on this.

Thanks!


 
Low priced Genuine GM Auto Parts
gchemist 
Senior Chevytalk Moderator
Posts: 21911
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
05-13-09 12:15 PM - Post#1696946    
    In response to ddunk1946

You can find wiring diagrams at www.autozone.com. You have to register on the site. One relay is the fuel pump. Two are the A/C compressor and control. I'm not sure on the other. It's probably a feature added. Examples: electric fan, power option or trailer lights.
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
Scotts 
Frequent Contributor
Posts: 1045
Scotts
Loc: McDonald, TN
Reg: 07-20-08
05-13-09 07:33 PM - Post#1697210    
    In response to ddunk1946

check yer e-mail - its jpg location chart....

if your sure you charge is ok, it's most likely the cycle switch, screwed into the side of the accumulator. it can be replaced without discharging the system. its on a check valve like a tire, unscrew it quickly, install new o-ring, screw on the new one. they are the usual culprit!
NO WARRANTY EXPRESSED OR IMPLIED! I may be wrong, have in the past and will be in the future!


 
ddunk1946 
Forum Newbie
Posts: 54
ddunk1946
Age: 68
Loc: Sugar Land, Texas
Reg: 01-17-08
05-14-09 03:53 AM - Post#1697348    
    In response to gchemist

Thanks, I'll look again on AutoZone. Maybe I was in a hurry (haste makes waste!) but it seemed they were more concerned with exterior lighting diagrams. Even a detailed Google search didn't help. Will slow down and look again.

 
ddunk1946 
Forum Newbie
Posts: 54
ddunk1946
Age: 68
Loc: Sugar Land, Texas
Reg: 01-17-08
05-14-09 03:54 AM - Post#1697349    
    In response to Scotts

Sounds like a plan, thanks! Will put that at the top of the list today. Will let everyone know what worked. I appreciate it!

 
48Butch 
Senior Member
Posts: 135

Loc: Renton, WA
Reg: 10-17-01
05-19-09 10:04 AM - Post#1700683    
    In response to ddunk1946

Was it the cycle switch? This whole thread could've been about my S10, right down to the year and model. Thanks everyone.

Butch
1948 Fleetmaster
1997 S10

 
gchemist 
Senior Chevytalk Moderator
Posts: 21911
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
05-19-09 04:10 PM - Post#1700881    
    In response to 48Butch

I had siliar problem when I replaced the old stock compressor. The clutch would not engage. We found out the high pressure switch failed. The system had to be evacuated to replace the switch. I should have know better than to use an old switch. The harness to the switch was bad too. Check both for operation if you have the system charged and everything else checks out.
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
dugman67 
Member
Posts: 35
dugman67
Age: 47
Loc: Kentucky
Reg: 01-11-04
05-24-09 07:31 AM - Post#1703636    
    In response to gchemist

So two of them are for the A/C? Would one of them help run the blower?

 
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