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Old 08-12-2012, 09:47 PM   #1
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2007 Expedition A/C knocking


I have a 2007 Expedition Limited. When the A/C is running it periodically will make a knocking sound. Sometimes it goes away on its own quickly, most of the time it immediately stops when I raise the temp 1 degree. What can be causing this?

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Old 08-13-2012, 06:34 AM   #2
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2007 Expedition A/C knocking


Sounds like a temperature blend door actuator. It's pretty common failure.

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