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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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 GB
1911 Model T Roadster Pickup, Car of the Century.
1915 Model T Speedster, Greatrace veteran
1997 E-350 Cargo 190K miles, co. vehicle.
2003 Windy Limited 100K miles.
2004 Monterey Premier 105K miles.
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