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Old 11-23-2009, 02:33 PM
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AC Compressor

I noticed when driving the other day with the heater on, when i put the air on defrost, for some reason my ac compressor kicks on, and its only on defrost, vents and floor it stays off and when i stop it dumps more water outta it than it did during the summer blasting the AC, is this normal?
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Old 11-23-2009, 02:58 PM   #2
Knows a couple things...

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Yes, the Defrost mode definitely uses the a/c compressor to remove moisture from the air which greatly speeds up how fast it can defrost the windows. That the a/c compressor turns on in the Defrost mode is a good thing, I wouldn't modify anything to turn it off. By the way, I noticed you have the perfect color TJ.

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Old 11-23-2009, 03:01 PM   #3
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you can add a switch to turn the AC compressor off...

for example on 99 TJ
CAV - A/C Heater Control
C90 2LG A/C Select input
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Old 11-23-2009, 03:01 PM   #4
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If by perfect you mean Red, then yes its Red.

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Old 11-23-2009, 03:51 PM   #5
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Also, in order to maintain the AC system seals the AC must run in the winter. Manufacturers in the US force the AC on when in defrost mode. They did this many years ago. This saves you from losing freon when the AC o-rings get dry from lack of lube.
Retired my 94 YJ 4cyl 5spd @ 200K
Now in a 04 TJ 4cyl 5spd CV @120K+
Both as a commuter vehicle in NW, NJ
April 2012.downsized and now a 99er.
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Old 11-23-2009, 05:05 PM   #6
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I pop the AC Compressor Clutch relay out and slide it into the dummy spot for the winter. That stops the compressor from turning. Gas mileage goes up, defrost still works great and I've never had a problem next spring. It's free and takes about 30 seconds.

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