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Temp Control Knocking Sound

This is a discussion on Temp Control Knocking Sound within the Ford Windstar forum, part of the Retired Ford Vans category; Just as the new owner got in the '02 Windstar Cargo this morning, I turned the heater temp control down ...

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Unread 01-27-2012, 07:51 PM   #1
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Temp Control Knocking Sound

Just as the new owner got in the '02 Windstar Cargo this morning, I turned the heater temp control down to zero, and soon there was a loud knocking sound from the center dash, much louder than the blend door actuator. Knocking went away when I turned the heat back up, and came back soon after turning it down again.

What could this possibly be?
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2003 Windy Limited 100K miles.
2004 Monterey Premier 105K miles.
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