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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 09-18-2015, 08:57 AM   #1
john ray
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Join Date: Feb 2015
Posts: 7
A/C not cold sometimes

My 2001 e46 (318i m43 automatic tranny) ran a good 50km this morning. I noticed that the A/C suddenly stopped working (fan was on but warm air started coming out). What could be the cause of this?

My electric aux fan's resistors are not working so it was connected directly to the + on full high. Could this be the cause?


John Ray
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Old 09-19-2015, 08:43 AM   #2
OEM ///Member
Join Date: Oct 2012
Location: Melbourne, Australia
Posts: 1,681
My Ride: 2004 330ci Msport
That is your cause. If the dme sees a fault at the AUX fan, it will disengage the relay for thee compressor
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Old 09-19-2015, 09:31 AM   #3
john ray
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Thanks Dave! I'll replace the aux fan ASAP
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