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You need a new blower fan, however reaching under the glove box and giving the fan a good couple of smacks could revive it long enough to make a winter trip to get it fixed
if it does this on any fan speed it is most likely a bad blower motor, if it inly while on a certin speed such as full high or full low it could be the fan speed resistor located right near the fan motor, screwed into the fan housing
it must be cut away within the surrounding plastic circles and reinstalled with dealer blower install kit. It's not the worst thing GM has done for design, but it's pretty bad.
Hi
Check for bad connection at heater resistor or try tapping heater motor lightly
with ignition switch on and heater switch on. Could be heater switch connection.
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