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no A/C

This is a discussion on no A/C within the GTO forums, part of the Vehicle Specific category; Purged and recharged the a/c in the goat last night and for some reaspn the a/c clutch isn't engaging...if I ...

  1. #1
    cutting and welding mark21742's Avatar
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    hugger orange
    2004

    no A/C

    Purged and recharged the a/c in the goat last night and for some reaspn the a/c clutch isn't engaging...if I use a jumper wire to hot the clutch locks up like it supposed to and I get nice cold air.

    Any ideas? Anyone know how to ohm the pressue switch by the driverside headlight?

  2. #2
    Smiles for 9.5 Years cammed goat's Avatar
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    Phantom Black Metallic
    2004 GTO M6

    You have a multimeter? I assume you need to switch it to read ohms and have the car switched to "run" to see if you are getting power. You check your relay?

  3. #3
    Junior Member MNGTO's Avatar
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    Black
    2004 GTO

    If you suspect a bad pressure switch you can run a jumper a cross the two terminals on the connector while the engine is running and A/C on to see if the clutch engages. If your A/C worked before you recharged it, are you sure you have the correct amount of refrigerant in the system?

  4. #4
    cutting and welding mark21742's Avatar
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    hugger orange
    2004

    I have a multi meter, but not sure how to test the switch because its a 3 wire switch not your normal two wire (on off switch).

    The a/c worked last year, but tried it for the first time the other day since my 408 swap. I have everything hooked up right in the engine compartment and have checked all the fuses and relays.

    I'm stumped here lol

  5. #5
    Senior Member qwkgto's Avatar
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    Phantom Black Metalic
    2005 GTO

    weird ,tryed mine yesterday it as well would not work,I have not checked anything as of yet,blew cold last year,maybe a control issue,had the heater do the same thing then all at once it started working again... let us know what you find..
    mods: custom built twins, built 408 w/l92 stock GM heads,GM matching intake,drag bags,frame ties,aluminum drive shaft, performabuilt 4l80e,Yank converter,ohios fastest and quickest 04-06 GTO 9.52 at 144mph. 1.50 60ft on stock rear end and shafts/suspension,on drag radials.

  6. #6
    Junior Member MNGTO's Avatar
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    Black
    2004 GTO

    If its three wires one will be power, the other will send the signal to a a/c module, and the third should be a chassis ground. Im not sure what wires are what, but i can check at work today.

  7. #7
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    Black
    2004 GTO A4

    Did you check the pressure of the charge? If you over-charge the system, it can prevent the compressor from running due to tripping the pressure switch. I did this on my 00 SS a few years back when I tought the air was not cold enough. Turns out that black interiors are just fricken HOT!

  8. #8
    cutting and welding mark21742's Avatar
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    hugger orange
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    Thanks MNGTO if ypu don't mind!

    Yup joe pressure is right on the money

  9. #9
    Junior Member MNGTO's Avatar
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    Black
    2004 GTO

    Sorry it took so long. The PPL/WHT wire is a 5v ref, GRN/BLK is pressure signal and GRN/ORG Low Ref. I would verify that you have 5v to the sensor. Then check the signal voltage. All of the wires go to the PCM

  10. #10
    cutting and welding mark21742's Avatar
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    hugger orange
    2004

    Thank you MNGTO! I'll check it out this weekend

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