Question about 1981 Chevrolet Corvette

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1981 corvette a/c system wont cool.

I have a 1981 vette, serviced the a/c system but still wont get cold. what should the low and hi side pressures be, still have the R-12 system in it. shouild I deplete the a/c system and change it over to the R-134 system?

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  • rphipockets May 16, 2009

    The compressor does kick on, I've put in 3 cans, still not real cold. does this have some type valve between the dryer and the compressor which is not letting the coolant to do its cooling. still have not found out the hi and low pressure for the R-12 system. thanks for info..

  • rphipockets May 16, 2009

    the compressor stays on until you select it off. thanks for the info, I will check and see if I can find the expansion valve and give it a little thump and see what happens.

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If you haven't found a solution yet, you may want to trace through the system and check on your hot water cut off valve. The 81 Corvettes have a special valve between the coolant line and the heater core that has to engage to stop the flow of hot coolant when the AC is turned on. I don't have a picture of one, but if you do a search on ecklers.com, it is easy to find and recognize. Another option would be to check the vacuum manifold switch and tension cable in your heater control. If the cable is seized or you hear a hissing from the vacuum manifold, your controls may not be engaging fully.

Posted on Jun 24, 2009

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  • Chevrolet Master
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Tell me more how much did you put in the system? and did the compressor ever kick on ? the compressor is turned on and off by a pressure switch on your dryer .. when your full or at right level with your freon the compressor will kick on .. let me know if this helps any .. you might not have quite enough in there yet to turn on the compressor.. usually empty takes about 3 cans to fill the system.. thanks Jerry

Posted on May 13, 2009

  • Jerry Koski
    Jerry Koski May 16, 2009

    Yes your expansion valve also has a screen in it near the firewall usually.. its in the line somewhere slipped in to a joint in your line , or near the dryer . maybe i can find out what your pressures are when I get back down to the shop tomorrow.. by the way does the compressor stay on all the time now after 3 cans ? or does it ever kick off ?

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