It clicks at the electric relay switch when I make a change in air-flow mode (windshield, floor, dash) but the air flow doesn't change directions. It just remains at partial flow at all vents. The fan and fan-speed control is working fine. Fuses are all good.How to fix Buick Regal 2001 heater air-flow contol?
The relay that controls the airflow operates on vacuum from the engine. Check the relay under the passenger-side dashboard to make sure all the tubes are connected and unbroken. Trace the vacuum tube to make sure that it is okay, patch as needed. It will likely lead out of the firewall in the engine compartment on the passenger side, travel over the wheel well and down past the battery to where it crosses over to the engine where it is connected to the intake manifold.How to fix Buick Regal 2001 heater air-flow contol?
You have a bad solenoid where the %26quot;flapper%26quot; is find were the directional flow control is and check the solenoid. You will have found the problem ....R
