Question about 1999 Chevrolet Cavalier

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AC blows hot air and compressor does not turn on. Can the AC relay switch be tested or bypassed to see if the compressor turns on?

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On the bottom of the relay there are numbers. 30 85 86 87 87a . Put a jumper in the relay slots at pin 30 and pin 87. This will power up the compessor clutch. The egine doesn't have to be running to do this, just the key on.

Posted on May 20, 2011

  • Paul9R Jul 20, 2011

    I have a 99 Z24 and the A/C has stopped working. I've gone through the Haynes manual schematic, and everything checks out so far. The problem looks like it could be the compressor as it appears the clutch isn't engaging. Where can I find the A/C Compressor Clutch Relay? Thx.

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Yes, if you can figure out which terminal is what, you will be able to jump. Be carefull dont send 12v up the wrong wire or you will fry computer. I would pull relay out and jump at the compressor pigtail, its much safer, and the car dosn't need to be running, all your checking anyways is that the clutch is working which should give a click sound every time you tag 12volts.

Posted on May 20, 2011

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Where would I pour in radiator stop leak on a 99 Z24 Cavalier.It has a small pihole leak,but the car has overheated on me once.

Posted on Jun 21, 2011

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Hi,
I had a similar problem with my Corolla. My compessor clutch wasn't engaging when I turned on the AC and the fuse was good. I suspected the worst and prepared to face a replacement of a compressor, but found out the fault was an AC relay switch.

This link from Autozone, will give you a picture and price of the switch:

http://www.autozone.com/autozone/catalog/parts/partsShelf.jsp?displayName=Relay+-+A/C+Clutch&currentPage=1&categoryDisplayName=Electrical+%26+Lighting&navValue=15701663&itemId=1663-0&parentId=57-0

My relay switch was located under the hood. Check your users manual.
I hope this is your fix... a compressor is costly!
Good luck...

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