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Thread: 89 Country Squire compressor clutch not getting power

  1. #1

    Default 89 Country Squire compressor clutch not getting power

    The clutch isnt engaging so I checked the plug and its not getting power. Fuse is good and the relay on drivers side fender was clicking so I replaced it but new one also clicks when ac is switched on. System is full of R12 and I dont know what to check next.

    It does not have auto climate control.

    Last edited by SVTDarin; 07-12-2019 at 09:01 AM.

  2. #2
    Beater gonna beat sly's Avatar
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    Mar 2010
    Lewisville, TX


    If the relay clicks, the ECM is switching the AC off because it thinks the throttle is wide open. Check the TPS sensor. The relay should not click when installed unless the key is on and engine is not running. Then the ECM will disable the AC so as to not damage the compressor or it's clutch during engine start.

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  3. #3


    Quote Originally Posted by sly View Post
    If the relay clicks, the ECM is switching the AC off because it thinks the throttle is wide open. Check the TPS sensor.

    The car runs, drives, idles fine, how do I check the TPS sensor or what am I checking for?

  4. #4
    Member WagonMan's Avatar
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    Sep 2004
    Bridgewater Ct.


    Did you try jumping the low pressure switch? WagonMan
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  5. #5
    I'm an air-conditioned gypsy gadget73's Avatar
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    Jan 2005


    Voltmeter from black to green on the TPS. With the key on and the throttle closed, it should be near 1 volt. The voltage should smoothly increase to about 4.5 volts with the throttle full open. If you have more than about 1.2 volts with the throttle closed, the TPS is most likely bad. You'll probably need some paperclips to poke into the connector in order to check this.


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