I have a 1989 Cherolet pickup with factory air. When I turn on heater or defrost, all the air comes out air conditioning vents. How do I fix this?
Dec 3, 2010 at 4:09 PM
heat/defrost on wrong route
JOHN28759
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The airflow vents are actuated by vacuum. Check for vacuum leaks under the dash. If you are lucky, you may hear a hissing sound with the engine running.
Dec 3, 2010 at 11:08 PM
89 model has electric blend door motors. mode door motor is located on left end of heater assembly,look under dash on driver side between colum and hump.3 inch square box 1/2 inch thick easy to access.
Dec 11, 2010 at 4:32 PM
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