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This is very most likely to be a failed temperature blend door actuator motor.

The motor is attempting to move the blend door, but due to broken gears inside, it can only get so far and then the door drops back down - thump thump thump.

See "Related Questions" below for more on this relatively easy & not-too-expensive repair.

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Q: 1998 Mercury Sable - Ford Taurus heater door is thumping?
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