Question about 1997 Chevrolet Blazer

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Cant get compressor to turn on by itself. can jump it with a hot wire and ground.

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  • barbeegsxr Jul 29, 2009

    ok just bought some refrigerant and added some today. compressor will turn on by itself now but only for about 1 second and stop. sounds like the engine is under a load because the rpm drops a little. the guage on the refiller when the compressor is off reads in the yellow[caution] range, but then the compressor turns back on for a second and the guage reads blue. keeps going back and forth until i turn the knob off in the truck. maybe there is air in the system and thats why the compressor wont stay on.not sure if i need that vacuum pump or what??? please help. by the way it is a 98 s-10 blazer

  • Travis Mcilree
    Travis Mcilree May 11, 2010

    Probably low on refrigerant, the low pressure switch would be turning it off.


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The guage on the filler can is the low side, if that is reading in the caution range, you can just about be sure that the high side is too high. You need to get a gauge that reads the high side to verify your reading.

The a/c compressor will always bog the engine down a little, it is a fairly significant load at idle.

As far as needing to purge the system of air, you only need to do that if the system lost its charge.

Posted on Jul 29, 2009

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