AC compressor clutch code A72F

racermp · 03-11-2019, 07:51 PM

Hey all,

So driving in the freeway and noticed the air blowing thru the vent started to get warmer. I noticed that the compressor clutch is not engaging.

Checked pressure in the system. There's alot, I checked the pressure switch by jumping the 2 wires with a paper clip, compressor clutch didn't kick in

Ecu shows auc sensor and also magnetic clutch air compressor A72F

anyone got any ideas what I should do next?

Thanks in advance

racermp · 03-12-2019, 09:18 PM

Measured the voltage for compressor clutch wire and its 14v. Check ground continuity on the compresser coil, nothing.

Does anyone know if they sell that coil separately, don't want to evacuate and refill freeon

Bengineer330 · 03-08-2021, 12:08 PM

I have this A72F fault as well. As far as I can tell the AC works as intended never have I had an issue of Warm air when I needed Cool Air, ect. So my OCD kicks in wanting for all the little boxes on ISTA+ to be green. I've ran through all the suggest test procedure which activates/deactivates the magnetic clutch and your supposed to listen for a click but I never hear it. Whenever I push the Max AC button the air is ICE Cold. So I'm confused.

Did you racermp ever solve this issue?

03-11-2019, 07:51 PM	#1
racermp Major 190 Rep 937 Posts Drives: F30 330i Join Date: Apr 2013 Location: Houston, TX iTrader: (1)	AC compressor clutch code A72F Hey all, So driving in the freeway and noticed the air blowing thru the vent started to get warmer. I noticed that the compressor clutch is not engaging. Checked pressure in the system. There's alot, I checked the pressure switch by jumping the 2 wires with a paper clip, compressor clutch didn't kick in Ecu shows auc sensor and also magnetic clutch air compressor A72F anyone got any ideas what I should do next? Thanks in advance
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03-12-2019, 09:18 PM	#2
racermp Major 190 Rep 937 Posts Drives: F30 330i Join Date: Apr 2013 Location: Houston, TX iTrader: (1)	Measured the voltage for compressor clutch wire and its 14v. Check ground continuity on the compresser coil, nothing. Does anyone know if they sell that coil separately, don't want to evacuate and refill freeon
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03-08-2021, 12:08 PM	#3
Bengineer330 Private First Class 46 Rep 101 Posts Drives: Le Mans Blue 2011 E92 M3 Join Date: Oct 2014 Location: Genesee, WI iTrader: (1)	I have this A72F fault as well. As far as I can tell the AC works as intended never have I had an issue of Warm air when I needed Cool Air, ect. So my OCD kicks in wanting for all the little boxes on ISTA+ to be green. I've ran through all the suggest test procedure which activates/deactivates the magnetic clutch and your supposed to listen for a click but I never hear it. Whenever I push the Max AC button the air is ICE Cold. So I'm confused. Did you racermp ever solve this issue? __________________ 2011 E70 Xdrive50i M-Sport Black 2011 E92 M3 ZCP LeMans Blue 2006 E90 330i Silver - Donated after 410,000 miles
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