Knocking sound next to third row seat. on Ford Expedition

Average mileage: 118,875 (22,000–223,000)
5 model years affected: 2003, 2004, 2005, 2007, more2015
27 people reported this problem
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Viewing 1 - 14 of 14 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 Expedition 145,000 mi,
Last winter my car was cold, when I turned the rear heat on, it began thumping loudly. Has done it ever since...
knocking sound by the third row
2003 Ford Expedition 80,000 mi,
Replaced rear ac mix door actuator
2015 Ford Expedition 22,000 mi,
When I turn on air for back of expedition, loud knocking noise starts.
2005 Ford Expedition 150,000 mi,
Knocking when in rear third row ac unit when heat is turned on
2004 Ford Expedition 190,000 mi,
Knocking sound heard behind middle passenger seat. Second row only not blowing hot or cold
2007 Ford Expedition 87,000 mi,
Knocking sound on right side rear by the third row and cargo area when I turn it on
2003 Ford Expedition 150,000 mi,
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.
2003 Ford Expedition 60,000 mi,
Heater damper bad second time
2003 Ford Expedition 110,000 mi,
I have had this same problem with the blend door and the Floor/ Ceiling door.
2004 Ford Expedition 123,000 mi,
Same problem never fixed