Coolant smell is outside of car only. Level in overflow tank kept dropping, but tech "couldn't find anything", so they put dye in it last time. The level has dropped again, so it's going back in.There's a PI out for a coolant problem. It's complicated, but the general notion is vapors coming out of the overflow tank. If you once had a leaky heater core and had it replaced, and any coolant got left in the carpet, it will continue to smell even after the problem is fixed.
I had a rattle that I thought was in the dash. Turned out to be the speaker trim ring on the passenger side. You sure that's not what's causing it?
Good luck getting the problems resolved. Do you have a case open with GM's customer support?
The rattle isn't the speaker/trim ring-checked and they were tight. It sounds like it's coming from the upper right part of the dash. They've "fixed" it three times, but the rattles comes back every time.
No case open with GM. Yet.