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96 chevy tahoe, ac compressor not turning at the pulley, any suggestions

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  • jnero402 May 31, 2010

    yes it is! thanks a million!

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  • Chevrolet Master
  • 1,675 Answers

Hi this could be a couple of things but it sounds more electrical then anything, best thing to do before anything is check the fuses make sure that you have not got any dead ones in the box, next would be the relay, they have a relay control unit this should also be in the fuse box, check that has not died, the reason why i think its electrical is because these systems have an electrically operates clutch which as it suggests when the switch for the air-con is pressed the signal is sent from the ECU ( engine control unit ) to the clutch on the pump which in turn engages it and pumps the fluid around...hope this helps

Posted on May 30, 2010

  • jnero402 May 30, 2010

    yes it does actually, I checked both the fuses and the relay and still nothing, what could be next?

  • steve morris
    steve morris May 31, 2010

    next thing to check would be the + and the - feeds to the pump, locate a volt meter and test the feeds to the pump, there should be a plug you can pull off, get someone to turn ignition on to position 2 but not turn over, then put your volt meter on the + - contacts in plug and get them to press the ac button inside, if you get 12.5volts then that will mean from the switch to the power supply of the pump is ok, this will mean the pump clutch is u/s but you can test this as well, get some long bits of wire, connect them to the battery, ( make sure you don't touch them together for obvious reasons ) then gently just touch them on the + and - contacts directly on the pump, if it spins then pump is ok, if not pump is u/s and will need changing, if however you do not get any power through the actual wires from the switch, you will need to remove the ac panel and locate the rear of the switch, remove the plug off the switch and then switch the volt meter to ohm's ( meter should beep when contacted) then test switch, you can do the same with the ac switch plug as you did with the pump, just get the wires on the + and - with a direct feed, this should have same affect as putting them direct on the pump, this way you will find out weather the pump, switch, or wiring is faulty and you then know which to change...hope that is what you need.

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