A/C Clutch not engaging

Discussion in 'General Chevy & GM Tech Questions' started by promod, Jun 3, 2010.

  1. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

  2. promod

    promod New Member

    Thanks again! I will report back what I find.

    You guys are awesome help for sure!
  3. MightyMax

    MightyMax Rockstar 100 Posts

    Yep, if you have a wire, you should be able to slip it into the power connector.
  4. promod

    promod New Member

    Power connector meaning the compressor side, not the harness side correct? :confused:
  5. MightyMax

    MightyMax Rockstar 100 Posts

    Right power has to go to the compressor.
    The plug/boot that plugs into the compressor is what supplies the power to the compressor when the switch on the Accumulator tells it too, based on pressure in the system.
  6. T-bone

    T-bone Rockstar

    Hi all

    So My AC system is not working and when the car is running the clutch on the compressor is not engaging. Just to be sure I am understanding correctly If I disconnect the low pressure switch and run a wire or paper clip to bridge the connector. If my clutch is not running because of low pressure or a bad switch then this would tell me if the clutch engages.

    My next move would be to check the pressure and if good it is a bad switch and if it is low I need a boost.

    I know some trucks have a combine Low pressure and high pressure switch it is not clear to me how to tell if that is in fact the case.

  7. dpeter

    dpeter Epic Member 5+ Years 500 Posts

    So how is it you know the charge is good if the compressor does not run?
  8. T-bone

    T-bone Rockstar

    you have to measure the pressure in the system with a gauge low side and high side should be equal and I have read somewhere between 50-100 Psi ( I have seen a large range of numbers.
  9. dpeter

    dpeter Epic Member 5+ Years 500 Posts

    T-bone, that will only tell you that there is refrigerant in the system but not how much.
  10. MightyMax

    MightyMax Rockstar 100 Posts

    Yes, but it will tell you that there is something in the system....so you can conclude that there is not a leak or a big one at least.

    Now once the compressor is turned on, and running.....then you can see what the pressure rises/falls too.....and go from there.

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