Knocking sound next to third row seat. on Ford Expedition

Average mileage: 129,000 (60,000–223,000)
3 model years affected: 2003, 2004, 2005
22 people reported this problem
12 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
2005 Ford Expedition150,000
Knocking when in rear third row ac unit when heat is turned on
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...
Replaced rear ac mix door actuator
knocking sound by the third row
2004 Ford Expedition190,000
Knocking sound heard behind middle passenger seat. Second row only not blowing hot or cold
2003 Ford Expedition150,000
Same issue with the knocking noise and never had it fixed. It only does it when I blow warm or cool air to the middle and back rows...
Thumping sound from around rear seat area. Only when heat/air in back is on. Have not fixed.
Heater damper bad second time
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
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