The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board > The 1973 - 1991 Blazers, Jimmys, and Suburbans Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 03-06-2004, 07:20 PM   #1
steves1967
Registered User
 
steves1967's Avatar
 
Join Date: Dec 2001
Location: Manteca, Ca USA
Posts: 305
90 Burb AC problem....

The compressor under the hood runs all the time- I hooked up a test probe to the compressors electrical plug and whenever the ignition is on the compressor has power- even if the heater/ac is turned off. Is there a relay that might have burnt out and failed in the closed position?

Thanks,
Steve
__________________
'71 Chevy 3/4 Ton Longbed
'22 Chevy Tahoe RST
'67 Firebird- 8 sec street car
'24 GMC CC 4x4 Duramax Dually
steves1967 is offline   Reply With Quote
Old 03-08-2004, 12:00 PM   #2
Grim Reaper
Registered User
 
Join Date: Jul 2001
Location: Atlanta GA
Posts: 1,704
The compressor runs in heat, vent and all the way to the left?
Now the blower will run reguardless of the selection anytime the key is on if it's a AC model. That's normal.

I would have to look at the diagram to be sure but I think that the compressor is tied into the big relay on the box on the passengerside. I think it's green with black stripe. The dohicky on the freon line with two wires is the same circuit so trace that back and see if it goes into that relay.
__________________
Grim-Reaper
70 Pontiac LeMans Sport Convertible, worlds longest resto in progress
Looking for 71-72 2wd Blazer or Jimmy Project
Grim Reaper is offline   Reply With Quote
Old 03-09-2004, 02:09 AM   #3
steves1967
Registered User
 
steves1967's Avatar
 
Join Date: Dec 2001
Location: Manteca, Ca USA
Posts: 305
Thanks for the help. Yeah the compressor runs all the time even when the control are all the way to the left. When i'm under the hood and I plug/unplug the connector to the compressor I can see it engaging. I'll trace the lines and see where they go.
Thanks!
Steve
__________________
'71 Chevy 3/4 Ton Longbed
'22 Chevy Tahoe RST
'67 Firebird- 8 sec street car
'24 GMC CC 4x4 Duramax Dually
steves1967 is offline   Reply With Quote
Reply

Bookmarks


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

Forum Jump


All times are GMT -4. The time now is 11:19 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com