Rear htg./AC does not transfer properly from overhead to side panel vents.
2004 FORD EXPEDITION
A constant "thump, thump" sound is made when the blower fan is turned on
and the air does not come out of the overhead vents. The switch light is showing green when it changes over, but the air is not being re-routed.
have the same problem?
Sunday, May 27th, 2012 AT 4:00 AM
A twig may fave found it's way into the blower motor cavity, this can happen. You may have to drop the blower motor and fan out to check and clear any obstruction.