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Installing A/C on my 75 Vette

Forum: C3 HVAC, Fuel, Emissions, and Exhaust

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Re: Installing A/C on my 75 Vette

Posted: 4/6/21 1:48pmMessage 11 of 13
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Cana, VA - USA
Joined: 7/3/2016
Posts: 382
Vette(s): 1975 Stingray 71 350 engine Flat top pistons Sniper fuel injection Hyperspark ignition Vintage Air air conditioning Borgeson power steering box
Stingre' said:

yeah I guess physically do you have a blue wire going to the thermostat ?


The blue wire comes from the AC control, goes through the trinary switch, then to the compressor.

My understanding of one function of this switch is to turn on the fans only when the pressure exceeds a certain value.  This is controlled by the blue wire going to the fan relay (see the diagram).  The fan does not come on immediately when the AC is turned on.

(The trinary switch also turns off the compressor if the pressure is too high or low.)

   

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Re: Installing A/C on my 75 Vette

Posted: 4/7/21 5:29amMessage 12 of 13
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Torrance, CA - USA
Joined: 4/7/2017
Posts: 5
Vette(s): 1974 Stingray Blue/Black needs work

ok, that helps. Friday I'm checking the wiring again, something isn't working right. Appreciate your help.

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Re: Installing A/C on my 75 Vette

Posted: 6/29/21 8:04amMessage 13 of 13
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Joined: 5/31/2021
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That sounds like a lot of work. But for the summer it is a very useful thing.

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