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2004 Z4 3.0 6 sp Air cond/ Heater issue

Discussion in 'Member Introductions' started by 485217, Jul 20, 2014.

    • Member

    485217

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    The automatic air cond/heater failed. The controls would not light up and none of the buttons(ie mirror heater, rear window heat) would function. The dealer said the control needed replacement. I replaced it with a new BMW part. That seemed to do the trick, the unit functions and both heat and air work. How ever the button for the rear view mirror heat and rear window hear is blinking and both are on when ever the car is running. I have disconnected and reconnected the car battery hoping that would help but it had no effect. The only way to shut off the heat was to pull the fuses for the Air cond/ heater controls(I tried to isolate the fuses for the mirrors and rear window but when the fuses were pulled the car would not start). Any one have any ideas?
    • Member
    • Technical Service Advisor

    charlson89

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    Did you say you got that new? Because that module would need to be programmed to the vehicle after replacement new.
    • Member

    485217

    Post Count: 2
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    Thanks for the input. That took care of the issue, air cond and heater now work fine. The rear view mirrors still heat but the car is never driven in bad weather so I had the dealer pull the mirror fuses. Dealer thought the software may be an issue and they may need to go thru some of the code to find the problem. Not worth the time and money to me. Thanks again for the input.

    04 Z-4 3.0
    06 530i
    78 New Yorker
    67 Mustang
    15 A-6 on order

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