HVAC issue.

[TimothyPaul]

Hi All - nothing happens when i turn my right A/C knob. Before i pull the dash out was wondering if anyone had any diagnostic thoughts.

 

[X-LION]

View attachment 423335Hi All - nothing happens when i turn my right A/C knob. Before i pull the dash out was wondering if anyone had any diagnostic thoughts.

Any clicking noise?

 

[TimothyPaul]

Any clicking noise?

Hi X-Lion - thank you for responding. No, clicking. I replaced the heater control door, last season. Isn't that the left knob that controls that door?

Thanks... Tim

 

[X-LION]

Hi X-Lion - thank you for responding. No, clicking. I replaced the heater control door, last season. Isn't that the left knob that controls that door?

Thanks... Tim

Did you change the actuator by any chance? When you change from heat to AC the door from the actuator switches.

 

[X-LION]

Did you change the actuator by any chance? When you change from heat to AC the door from the actuator switches.

View attachment 423536 View attachment 423537

The gear on the actuator broke and I had to replace the actuator. I hear air blowing but not through the vents.

 

[TechGuru]

I believe the heat/cool door is electrically controlled. The mode flaps controlled by the switch in the photo are all vacuum controlled. If none of them are working I would first look for a main vacuum line leak under the hood.