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The other Experts and I are working on your answer. By the way, it would help us to know:
-Do you the EATC (Electronic Automatic Temperature Control) or Manual Control?
-What else have you already tried?
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Thanks for using Just Answer, the most common cause of the problem you are having is a defective Blend door actuator, that is was is making the clicking sound. I am sending you directions on how to replace, hope this helps you out.
Removal and Installation
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