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E89 Z4 (2009 - current)

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Old 07-08-2012, 03:16 AM
tranquility tranquility is offline
Sportscars only.
Location: Toronto
Join Date: Apr 2011
Posts: 83
Mein Auto: 2011 Z4 sDrive 35i
Stupid HVAC prb has everyone stumped

Not sure if anyone has this prb. Basically, every now and then (probably 30% of the time I start the car), the whole HVAC sys doesn't work, so all the lights are inoperative in those '4 circles' in the dash (save for the rear defrost). If it's on or off, it stays that way until the next time I turn on the car, i.e. if the HVAC is off, it won't suddenly work when I'm using the car, and vice versa.

The dealer has changed so many parts and I thought that they finally solved it, but no, the prb still exists!

Parts replaced:
-blower resistor motor
-heater control
-control unit

I'm not a trained tech, but how hard can it be to diagnose this prb??? Any ideas?
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