so today im out shopping with the wife and when i return to my car in the parking lot i go to start it up and i hear this knocking on the passenger side right where the airbag is. any one have this same issue? im worried the airbag will deploy while driving or something. everytime i start the car it does the same knock. thanks

 

could be something in the hvac system. possibly the recirc

 

got it checked out its the relay fan. stuck so idk if im gonna bother fixing it.

 

Sorry. I don't mean to thread jack, but I wanted to say that I've got a similar issue.

I've got knocking noises coming from the center of my dash. It's right where the air conditioner is. When I took it to a Chevy dealership earlier this year, they said some **** about how my car being parked outside in the hot CA sun might've caused my dash to expand slightly and the clips or some **** are knocking.
Idk if I buy that, but it doesn't bother me too much. It only does it on cold starts and cold weather days. When the engine warms up or the day is hot already, the knocking goes away.

Also, it only happens around 1500-1900 rpm and then again from 2300-2700 rpm. Any other rev range, it doesn't do it (as loudly, maybe?).

Another Chevy mechanic told me, "It's GM build quality, dude. Sometimes you've got to deal with it."