Knocking sound next to third row seat. on Ford Expedition

Average mileage: 131,700 (78,000–223,000)
3 model years affected: 2003, 2004, 2005
16 people reported this problem
8 people shared problem details
Knocking sound in the back of the car when the a/c or heat is on. Replaced the rear ac blower damper motor. = $40.00
6 people like thisFlag inappropiate
2004 Ford Expedition190,000
Knocking sound heard behind middle passenger seat. Second row only not blowing hot or cold
2 people like thisFlag inappropiate
Replaced rear ac mix door actuator
knocking sound by the third row
2003 Ford Expedition110,000
I have had this same problem with the blend door and the Floor/ Ceiling door.
2004 Ford Expedition123,000
Same problem never fixed
2005 Ford Expedition145,000
Last winter my car was cold, when I turned the rear heat on, it began thumping loudly. Has done it ever since...
KNOCKING SOUND WHEN HEAT WAS ON IN BACK VEHICLE BLOWER
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