Question about 1996 Buick LeSabre

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1996 Buick LeSabre AC Stopped Working

Ok, I bought this car from a friend and she said one day last summer the AC just quit one day. I checked the fuse inside the car, the maxi fuses under the hood and replaced the ac relay...all good. The compressor still will not kick on. I bought a R134A Kit at the auto store. Now I have not put any in yet. I did hook up the hose with the guage just to see if there was pressure in the line (making sure it will even hold pressure that there were no leaks so to speak). It is reading about 85 psi with the car turned off. I know that once the clutch engages, the pressure will drop, but as of now it is in the red and the clutch will not engage. Any Ideas? I would like to "jump" the compressor to engage it, to see if the compressor even engages, but I have no idea what wires to jump. There is a plug in the back with 3 wires, I am taking that it is the pressure sensor and a plug on top between the pulley and the compressor with 2 wires, a green and black.

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  • Shadow1989 Jun 29, 2009

    By the way, I am attempting to see if it is the compressor or not. I know that once I engage the compressor, I will get a more accurate reading on the gauge so I can tell if it needs more refridgerant or if something else is bad.

  • Shadow1989 Jun 29, 2009

    And I don't know if this is relevent or not, but my climate control does switch from heat to cold, however it will only blow out of the defrost and floor together, no matter if I put it on vent floor or defrost. Guessing it is a door acuator of some sort, not sure if that really would prevent the ac from kicking on though....never know with the newer

  • Shadow1989 Jun 29, 2009

    ok...there is no sight glass that I can see of. Secondly, the drier only has 2 1" metal lines going to it. No sensors, switches, plugs or nothing. The only electrical plugs are the cut out as stated above, then there is a plug on the line on the back side of the compressor with a round plug and 3 wires. This is all I can find, maybe I am overlooking something...

  • Shadow1989 Jun 29, 2009

    That is the plug that is on the line behind the compressor, rockauto says it is the -

    ACDELCO Part # 155742 {#22664328}

  • Shadow1989 Jul 14, 2009

    ok...I jumped the compressor clutch plug, black wire to neg battery and the green wire to the positive. When I touch the green to the positive the clutch goes in about a millimeter, but not enough to make contact. I also checked the plug. It read 0 on the multimeter, then i turned the temp control down to 60 and the voltmeter shot up to about 12.4 volts. So this tells me that there is enough refrigerant and all the sensor are working, or it would not be sending 12 volts to the clutch coil. What would be some possibilities on why the clutch is not engaging all the way?



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No this is a high side cutt out for compressor,,,,low side pressure switch is what ur looking for look on dryer it should be ther jump them 2 wires,if it kicks on add freon 85 on low side not running is about out but if the ac does work and gets cold plug sensor back up and if it doesnt work,unscrew switch and go blow it out with a air hose (compressed air)and tap it around /put it back and try it /if it doesnt fix it buy a new switch

Posted on Jun 29, 2009

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jun 29, 2009

    if u can figure out the schematic of the ac relay jump it ther to engage ac clutch an activate fans ,the switch on the rear of the compressor is high side cut out,this model uses computer to cut out copressor when under charged but try this easy and simple way first disconect neg. batt. first for about 15 slow seconds and reconect this will most likely star up the system for short while but charge up system imediately and make sure the fans come on ,,,,let me know if this fixes ur problem


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The first thing to check is if there is enough gas. The compressor will not work when the gas is low. There is a small inspection glass on the line. This needs to be clear. If you see streaks or bubbles means the gas is low. Never mind the pressure or wiring for now, Add one can of gas and this should get that first part done.

Posted on Jun 29, 2009


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