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The problem you have is the GM heater control unit has lost it's calibration, which can happen from time to time. The way to reset it is, start your car and turn your heater off, and shut off the car, pull out the keys. Then with vehicle off, disconnect the battery, (or batteries if two). Let sit for 10 minuites, then re-connect battery. Get in and start the engine, DON'T touch anything, let the heater control unit re-calibrate for at least 40 seconds, (by the clock), then try turning on the heater. Usually problem over, ! W. Cook Canada

try the above first, its free. If that doesn't work, if you have all speeds on your blower motor, then it sounds like the gears in the drivers blend door actuator are stripped, and the door is stuck about 1/2 way.

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Q: Why does 2005 Chevy Impala blow heat on passenger side and cool air on the driver side when the heat is turned on?
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