Question about 1995 Pontiac Bonneville

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1995 pontiac bonneville A/C compressor

I am trying to find out what would keep my A/C compressor from working. I can jumper it and get it to engage so I know it works. How can I tell if the PCM is sending a signal. Thanks Rick Hansen

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  • Rick Hansen Oct 16, 2008

    I get 12 volts to the a/c relay on the firewall. but I do not get 12 volts at the a/c compressor, how do I figure out if the PCM is sending the signal to turn it on. Thanks Rick

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You can check for 12 volts going to the compressor when it is time for it to come on. this voltage passes through several switches along the way that could prevent it from coming on. the refrigerant is probably low and preventing the compressor from running

Posted on Oct 16, 2008

  • hansandfranz Oct 18, 2008

    the pcm grounds one leg of the relay which in turn sends power to the compressor. the relay should click when it is switching on or off.

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