2003 Ford Expedition airflow changes on its own

R4BLESSINGS

MEMBER
2003 FORD EXPEDITION
V8
4WD
AUTOMATIC
100,000 MILES

The airflow changes from the dash vents to defrost or floor on its own. When you first start the vehicle it will flow from the dash vents. As soon as you begin to drive the airflow goes away from the dash vents.
Also I've seen alot of folks having the rear AC accuator problem on the forums. I have had to replace mine every year since the vehicle was new but one. I bought the vehicle new in 02'. This last time it was no longer under warranty and it cost me $400.00 at the dealership, which I won't do again. My question here is, it looks like Ford is using extremely crappy accuators if they have to be replaced that often and if so many folks are having problems with the same parts. Is there any recourse for all of us Expedition owners with this obvious shoddy part problem?

1 Reply

MERLIN2021

MECHANIC
17,250 POSTS

Find the vacuum line that comes out of the firewall, this is the supply line, and it goes to a small reserve tank in the engine compartment or under the dash, then another line goes from the tank to a check valve, then to manifold. If the reserve tank cracks, or the supply line breaks, air will divert to the defrost vents when accelerating, or all the time. The reserve tank supplies needed vacuum to A/C system during these times! This should solve the A/C problem, as for the actuators. I havent seen many questions on them yet?