No Air from Vents

[mattgee3]

In my E90 M3, the air and heat stopped working out of nowhere. Never made any weird noises or had any issues. On cold or hot, nothing comes out of the vents. When I turn it on I don't hear anything.

I checked the related fuses and they were all fine. Any other suggestions on what the issue might be?

[VtecforV8]

I'd guess it's the blower motor shorting out, which isn't that expensive and can be replaced yourself. It's just behind the glvoe compartment. I did it a few years back after reading all the forum threads about it. Good luck!

[mattgee3]

That was my next idea as well. Just wasn't sure if it was a common issue on the e90's or if there was something else to check first. I'll replace the motor and update if that was the issue. Thanks!

[kolosy]

Originally Posted by mattgee3

That was my next idea as well. Just wasn't sure if it was a common issue on the e90's or if there was something else to check first. I'll replace the motor and update if that was the issue. Thanks!

before you pull it all the way out, confirm that that's the issue by giving it 12V directly (disconnect the existing wiring first, of course).

[BP709]

Have you had the blower recall performed? The wiring burns up and depending on the condition of the wiring upon inspection a “long” or “short” repair harness would’ve been installed and a new final stage with the long harness.

[VtecforV8]

^^ I'd completely forgotten about this. I had this done years after i replaced the motor itself, but I think I remember reading that if the motor is damaged 'because" of the wiring harness issues, you might get a free replacement. Maybe worth a shot, if you can schedule the recall service quickly enough.

My local dealer has mobile service for recalls and did the airbag and this at my house in 30 min.

[mattgee3]

Yes the recall was already done.

[Brandoch]

What's the condition of the battery? The car will start shutting off various devices including the blower fan if voltage is too low.

[mattgee3]

Originally Posted by Brandoch

What's the condition of the battery? The car will start shutting off various devices including the blower fan if voltage is too low.

Didn’t think of that. I’ll test it when i get home tonight