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Good diagnostic association!

The thumping is likely being caused by a failed temperature blend door actuator motor. Gears inside the motor break and the door starts to move and drops back down when hitting the broken gear = thump thump thump.

See "Related Questions" below for lots of help with changing this part - not too hard nor terribly expensive.

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Q: There is a noise behind the dash like the noise that windshield wipers make. Could this thumping noise be the cause of the lack of air conditioning in a 1998 Mercury Sable - Ford Taurus?
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