2005 impala

Asked by Aug 23, 2019 at 08:47 PM

Question type: Maintenance & Repair

My heater blows hots on the passenger side but
the driver side and defrost only blow cool air. Any
idea on what is causing this?

2 Answers

87,335

The ductwork has blend doors that move to get the temperature to the vent where you want it. Could be that one of the blend doors is sticking because the door actuator is defective. You may have noticed a tapping sound under the dash from a defective actuator. The doors are located under the dash and possibly behind the glove box; the actuators are small boxes. Try a spray lubricant on the actuators, or remove them to see if there's a broken sprocket. Might need replacing. It's not a difficult fix.

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