98 Buick Park Ave Heater

This car has 3 vents coming from the heater to the floor. The left goes to the driver’s floor, the middle vent is directed to the rear seated passengers and the right vent goes to the passenger side. The left vent is blowing cold air. I removed the air filter (first time ever and it was in bad shape). No help. I am considering a radiator flush. Hopwever there is gadget in the left and right heat vent that I’m thinking maybe a temp gage or moniter. If so and if the one in the left, driver’s side, is bad that may be my problem.



Any comments, thoughts, insights or goodf advice available from you gvuys??

do a search for left air temperature actuator problems.

Thank you

Thank you