I have a 2014 528i, and when driving today, I heard a sound, and shortly thereafter the vents were blowing hot air. There are no lights on the dash indicating a problem, and I was not running hot. Belt is fine.
Your car is a rolling computer, and you're going to need to take it to a BMW specialist shop with the appropriate BMW specific diagnostic computer, to read the codes in the ~50 computers of your car.
Most likely, they're also going to need a professional air conditioning machine, to evacuate your a/c system, vacuum-test it, and refill with exactly the correct amount of refrigerant. It's quite likely that your a/c system has just had a major failure.
In example, my boss just bought a 2013 X5, was driving it home from the auction, cool as a cucumber....and the a/c stopped working. There was a code in the Junction Box Electronics for the compressor clutch...no codes in the A/C computer. With precise filling, and after clearing codes, the compressor still would not spin. Tested the hot wire to the compressor, engine running, a/c on, and it had 14 volts. Therefore, the compressor is bad.
This is not to say your compressor is bad. It just says you can't diagnose this without a professional BMW shop laying hands on your car.
Chris Powell
Racer and Instructor since, well. decades, ok?
Master Auto Tech, owner of German Motors of Aberdeen
BMWCCA 274412
German Motors is hiring ! https://www.bimmerforums.com/forum/s...1#post30831471
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