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Re: very fast tapping sound (voatech)

Quote, originally posted by voatech »
It is the cold warm air curculation flap motor and it is very common although I have only fixed a couple with updated motors. not the purge valve.

How would that motor make a "tapping/ticking" noise? Doesn't that (servo) motor
only runs to move the cold/warm flap when one changes the temperature setting?
At other times, it doesn't run, nor does the flap move.
Also, what is this "purge valve"?
Just curious...
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