Question about 1998 Cadillac DeVille

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1998 Cadillac DeVille No AC

My father has a 98 Deville with no AC. The dash says AC OFF low refrigerent. I bought a 134-A recharge kit and the gauge reads 145 psi on the low side. There appears to be plenty of freon in the system, maybe too much? I checked the AC fuse and it was good. I jumped the low side pressure sensor to see if that would engage the clutch on the compressor but nothing. The compressor moves easily when turned by hand so no problem there. Can anyone help guide me in the right direction. It is 96 degrees in Florida and I wanted to fix this for fathers day.

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  • tfitsell Jun 21, 2009

    Greg,

    You hit the nail on the head. I relieved the pressure, re-set the computer and the compessor kicked in. I added 1 lb of gas to get to 45 psi on the suction side. Nice and cool with a happy father. Great job. The last time I used this site I found my Taurus airbag light to be a seatbelt problem. I love this service and recommend it to anyone with a problem.

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If you're getting 145psi on the low side, it's severley overcharged. Although there's no benchmark for proper low side pressure for all cars, It only takes 20psi for the compressor to work, but pressures in the 30 -40psi range should get adequate performance out of the compressor. My Cadillac had a safety feature that would shut down the compressor (as your compressor has shut down) if an unsafe condition is present. (Unsafe as far as unsafe condition for the compressor) To reset the compressor, I had to disconnect the negative battery cable for 30min to reset it. In the meantime, relieving the pressure on the low side would be a good idea. (try getting it down to 80psi and work from there). Keep in mind, if your radio has any specific codes to unlock it, write them down due to the radio also resetting with the disconnection of the battery. After reconnecting the battery, the AC light on the inside of the car should reset itself. If after all of that, the compressor still won't turn on, you have a relay issue or a bad compressor. I hope this long winded response answers your question and wish your Dad a happy Father's day for me. All the best!
Greg
p.s. Please post back with any other questions you may have.

Posted on Jun 21, 2009

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