Recently I installed a new battery and accidentally crossed the contacts on battery. Long story short, fried my alternator which I had to replace (expensive), and a dozen other fuses. But now also my ac/heater is not working. The blower motor is working and blowing air, but my AC does not activate when button pushed or heater. Can anyone inform me on possible problems to check before spending a lot of money.
You should put your car information as there are differences in the E38 models. In general, fuse 20 powers the IHKA (heat/air control module) and fuse 11 powers the a/c compressor. Do the controls/lights all work on the module?
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