Question about 2005 Chevrolet Cobalt

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A/c blow hot air then cool air been doing this about two weeks now.when compessor turns on shakes whole car. and turns off and on every 5 to 10 secs a/c never gets cold i just filled it with feron and used an feron gage

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  • smithcolin59 Jun 24, 2009

    What does it mean to clip the wire from the pressure switch and jump it?

  • smithcolin59 Jul 05, 2009

    WELL WE GOT IT WORKING FINE SEEMS THERE WAS TO MUCH FERON IN IT SO DISCHARGED ALL ERON ND MOSITURE RUNS GREAT NOW THANKS

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  • Chevrolet Master
  • 3,854 Answers

Just to make sure you have the right reading, the low side should be 30psi to 50 psi and the high side should be 150psi to 200 psi, Any other readings will give you poor a/c performance and if it's to high your going to have system damage. The other thing to is your a/c pressure switch may be bad and that's along the low pressure hose or on the accumulator (Air Dryer) It looks like a oil pressure switch with two wires clipped on to it. If that has gone bad it will give you the same on, off or stay off all the time. You can un clip the wire from the pressure switch and jump it and see if the compressor stay's on, if it does. Replace the switch and you can do it fast enough that you won't loose that much R134a. If your still having the on, off with the jumper wire to the pressure switch, replace the a/c relay. Good luck and hope this helps, keep me posted, be glad to get you running cool again.

Posted on Jun 24, 2009

  • Harvey N Tawatao
    Harvey N Tawatao Jun 24, 2009

    Unclip > disconnect the wire harness from the pressure switch and jump a wire from one terminal to the other at the harness. 

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