O/T 2004 Chevy Blazer

Anonymous-0 · Dec 17, 2008

Started the blazer last night and turned on the defrost. When the air compressor/cluch engaged it nearly stalled the engine. The compressor immediatly shut off and 5-10 seconds later it occured all over again. With the defrost or air-conditioner on about every 5-10 seconds the same thing happens over and over again. If I turn off the air/defrost it smooths out and runs fine.

Any Ideas?

-steve

Brokenwrench · Dec 17, 2008

Your AC should run in the defrost setting. Possibly a bad compressor. unplug it at the compressor, that should disable the AC clutch.

Had you been hearing any noise or had problems with AC? Not an expert on AC but I would have thought the compressor would give you some warning(bearing noise) before going out.

Roy in georgia · Dec 17, 2008

you can unplug the compressor and it won't do that but it sounds like the compressor is locking up not sure but if you unplug it the clutch will not engage and you can use the heat as you take it to a shop for them to look at it

keh · Dec 17, 2008

What Roy and Brokenwrench said. Daughter's Tahoe just had that problem, the mechanic unplugged the AC compressor, runs fine now. Can fix AC when it gets hot weather.

KEH

ffdfireman · Dec 17, 2008

The compressor is locked up. Unplug the coil and you"ll be ok. If you change the compressor make sure you change the oriface filter too. It will trap the metal debris in the system. Good luck

dave guest · Dec 17, 2008

Extreme temps used to keep the AC from running. That was long time back. Not sure about new ones. They still may wait for warmup from engine. Stationary units like rooftops have crankcase heaters to keep compressor running at low temps.

Anonymous-0 · Dec 18, 2008

I had some time to look at the blazer again last night. If I start the blazer with the temp dial set to defrost or AC the compressor will start and run just fine. If you then turn the dial to off and then turn it back on to defrost or AC it will start cycling the compressor on/off and lugg the engine down again. Could there be a relay going out or do these symptons still point to a bad compressor? Maybe low freon?

Thanks for everyone's help!
-steve

dave guest · Dec 19, 2008

What you said upon second look, seems like compressor should not instantly come on without a time delay of some kind. Most compressors will slug on an instant restart because oil has to have tim e to return to crankcase. Oil cannot compress hence the slugging. Think its a control problemof some type.

dave guest · Dec 19, 2008

You should not be able to make compressor come immediately back on. It needs time for oil to return to crankcase before starting. There is a control problem, I think. Look for a time delay circuit.

O/T 2004 Chevy Blazer

Anonymous-0

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Brokenwrench

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Roy in georgia

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keh

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ffdfireman

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dave guest

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Anonymous-0

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dave guest

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dave guest

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