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X5 E70 (2007 - 2013)
E70 BMW X5 produced between 2007 and 2013. Discuss the E70 X5 with other BMW owners here.

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Old 05-30-2017, 05:30 AM
RAD2009 RAD2009 is offline
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Location: 24060
Join Date: May 2017
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Mein Auto: 2009 X5 E70
A/C Compressor Clutch E70

The AC on my 2009 X5 E70 stopped working, getting code A72F - Compressor Clutch [Junction-Box Electronics] and can see the clutch is not engaging. Gas [freon] gauge indicates the system is full but no cold air; if anything, the blown air is warmer than ambient when AC is on. All AC fuses are good....is there a relay somewhere that I'm missing? Any help is appreciated, getting into the 80s soon. Thx.
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Old 05-30-2017, 07:18 AM
Doug Huffman's Avatar
Doug Huffman Doug Huffman is online now
Nuclear engineer
Location: Washington Island, Wisconsin, thru Death's Door
Join Date: Apr 2015
Posts: 4,424
Mein Auto: 2012 Feb 11 X5 35d (E70)
The ECU must enable the AC clutch. IIRC the motor must be able to support additional torque >20 Nm and up to 30 Nm. (Torque times angle rate is power)

Pressure in a static AC system is the saturation pressure for temperature for the refrigerant and nearly meaningless. Pressures in an operating AC are guidelines to an experienced technician.

The BMW IHKA HVAC is a hot water controlled system. There is a cold start interlock that warms HVAC air until stable temperatures are established. The BMW IHKA HVAC technical description is in the E70 knowledge base sticky. It's 70 pages long.
I am responsible for what I write, not for your understanding of it.
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