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Car won't blow any air warm or cold from vents. Tried replacing fuses, relay, and blower motor. Recently had alternator and serpentine belt replaced and issue happened after short time after that but shop said no need to reset ECM or anything. Any ideas on what to try next?
Are you SURE you replaced the relay? It's a common failure item and it's located BEHIND the cabin fuse box.
Unbolt the fuse box, lift it up (there's not very much room due to the wiring harnesses) and you will see some blue relays stabbed on the back of the fuse box, here is a picture of the layout for your 2010 G37.
