The 1947 - Present Chevrolet & GMC Truck Message Board Network

The 1947 - Present Chevrolet & GMC Truck Message Board Network (https://67-72chevytrucks.com/vboard/index.php)

- The 1967 - 1972 Chevrolet & GMC Pickups Message Board (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=3)

- - AC compressor wont kick on.. (https://67-72chevytrucks.com/vboard/showthread.php?t=703536)

im4darush

04-08-2016 03:22 PM

AC compressor wont kick on..

Can you guys help me out with this please? I am working on a 72 Cheyenne super with factory air. My AC compressor will not kick on. Fan switch works fine on all speeds. Air blows strong from the vents. Can you please tell me what actually signals the compressor to turn on? I tried moving the top lever to AIR but still nothing. Thanks for the help.

im4darush

04-08-2016 03:40 PM

Re: AC compressor wont kick on..

I jumped the low pressure switch and it came on. I guess its low.

Andy4639

04-08-2016 03:50 PM

Re: AC compressor wont kick on..

There is a plunger switch behind the duct work right before the floor vent. If it's not pushed in it want come on. This is what makes the compressor kick on per the system. So if you jumped the LP switch out and it ran then it's working. Don't run it long with that switch jumped.
This is the factory manual drawing of the wiring. :chevy:

http://i1233.photobucket.com/albums/...97F5F24FA6.jpg

All times are GMT -4. The time now is 08:17 PM.