E46Fanatics - View Single Post - A/C diagnostics, lots of info w/pics
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Old 10-22-2011, 09:20 PM   #4
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Join Date: Dec 2010
Location: MD, USA
Posts: 1,489
My Ride: 01 330CI 6MT ZSP EU3
No one, huh?
Nevertheless - an update. Pressure when A/C is off may be around 3 - 5 bar. I also located the pressure sensor, it is on top off the dryer/receiver that is under the passenger side headlamp. I performed a following test: when the car is completely cold and A/C compressor can't engage (INPA pressure sensor value is -1.8 bar) I heated the sensor by a heat gun and the value of the pressure started to grow. Once it reached 1.8 (after about 5 minutes), A/C compressor engaged. Here is the setup:

Last edited by Nervous; 10-27-2011 at 11:18 AM.
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