When I turn the heater on low it blows out a little bit of heat but if I turn it up to medium or high, it makes a real loud noise and almost shakes the car. Please advise.
I have heater problems in my 2001 Alero, on 2001 Oldsmobile Alero
Pull the blower motor and remove what the rodent left in there. Your blower wheel is not balanced.
1 more answer , 2 more comments
blower motor or fan blades are bad
Greg come to the Midwest and see what we pull out of blower wheels, AINT PRETTY.
Ewww, happens here in Pa a lot too. Can be a pretty disgusting repair to have to perform.