We have had 3 Impala’s and never had these problems. 1) the driver window screeches when I put it down (automatic windows); the dealer says it needs to be lubricated. no other window does this on that car or the prior ones. it is high-pitched and gets looks from anyone nearby. i think the dealer is giving me a line because i am a female.
2) when the car warms up and has heat, and I stop at a light, the air blows cool. again, they found no problem. makes no sense to me (after driving for miles it still gets cool when idling or stopped). same response from the dealer.