I believe he's referring to the blend door actuator..Its a small white box maybe 3x3inches with gears internally, they tend to strip i just replaced mine its a pretty big job...I hear you can replace the actuator without removing dash but I was not able to without removing dash. its located down and left of the stero... you can special order part from auto zone..I believe the part number was 604 207...found a lot out about the job online and also from chiltons wasa big help.
Testimonial: "The information is correct. Its the blend door actuator. Got the part from the Murcury dealership for $76.99. Had to remove the dash."
Your temperature actuator is broken internally. replace the actuator.
Testimonial: "Thanks just replaced that part today. Vehicle is warm now."
SOURCE: Loud clicking noise from dash whenever heat
I have and 2002 with rear air and had the same noise and problem in the back. There is motor in the back that moves a flapper door open and closed to blend the hot and cold. The motor has plastic gears in it and they strip out making a clicking noise when the motor cannot hit the point that the heat control dial is being set too. Probably the same set under the front dash. You will more than likely need to by a new motor assy.
SOURCE: front and rear heaters blowing cold air,makes a
Sounds like the blend door actuator needs to be replaced. It controls the air tempature from the vents and is mostly plastic. They break often.
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