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Topic: AC Compresser question

in Forum: C3 Cooling and Heating Systems


AC Compresser question

Posted: 5/29/22 7:34pm Message 1 of 6
Former Member
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Milford, DE - USA
Joined: 11/6/2021
Posts: 67
Vette(s): 1977 C3 Auto Coupe Lt Blue/Dk Blue Prev. 1968 C3 convertible 4spd Red 1984 C4 Automatic Silver 2000 C5 Automatic Black

First of all I want to thank everyone who's been most helpful in answering my questions! I'm learning and it has been a tremendous help!

Here's my lastest dilemma..I cannot get my AC Compressor to kick on via Control switch on console. The switch looks like it has only vacuum lines coming from it. Inclosed is a picture of the wiring coming from compressor. The compressor has 3 wires..! Black (Ground) and two Green. One of the Green wires runs to the "Low pressure switch" which when followed its disconnected.(Why I don't know and were it goes I also don't know,) I was thinking it was for a fast idle switch which this carb does not have. I cannot find the other end to connect it to. The other Green wire goes into the wiring harness by the fan relay. I don't know were it goes from there. I'm thinking into the harness thru the firewall. Not sure though. I have no power to Low pressure switch at all. Howeve, If I connect that wire thats disconnected to a live source and move the AC control switch to AC High or low it will kick on the compresser and blow cool air thru floor vents. But I cannot get the switch to adjust the air to upper vent or defrost. Looks like I have mutiple problems? Is there a hot wire and were might I find it at tye control switch..Like I said I only see tiny vacumm lines coming from it. Any help would be gratefully appreciated! Also I haven't tore the dash apart yet




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Re: AC Compresser question

Posted: 5/29/22 7:44pm Message 2 of 6
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Overland Park, KS - USA
Joined: 7/9/2003
Posts: 914
Vette(s): 1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day. 2023 Accelerate Yellow HTC Stingray

I think you're going to have to get a Factory Service Manual that has the wiring diagram in it. Or you can get just the wiring diagram from some of the aftermarket Corvette suppliers.

Do you know what kind of freon it has in the system? You will need to know that in order to determine if it has the proper charge in it.




1973 L-82 4 spd

Re: AC Compresser question

Posted: 5/31/22 5:44pm Message 3 of 6
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Woodland, WA - USA
Joined: 10/14/2003
Posts: 1171
Vette(s): 1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

 




Re: AC Compresser question

Posted: 5/31/22 5:45pm Message 4 of 6
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Woodland, WA - USA
Joined: 10/14/2003
Posts: 1171
Vette(s): 1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

hope these help




Re: AC Compresser question

Posted: 5/31/22 5:46pm Message 5 of 6
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Limited Member
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Woodland, WA - USA
Joined: 10/14/2003
Posts: 1171
Vette(s): 1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

this is for 77 




Re: AC Compresser question

Posted: 5/31/22 7:55pm Message 6 of 6
Former Member
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Milford, DE - USA
Joined: 11/6/2021
Posts: 67
Vette(s): 1977 C3 Auto Coupe Lt Blue/Dk Blue Prev. 1968 C3 convertible 4spd Red 1984 C4 Automatic Silver 2000 C5 Automatic Black

Thank you! Thank you! Thank you!

 

That helps tremendously!




in Forum: C3 Cooling and Heating Systems


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