2002 Expedition Information 5.4L

[Captain Don]

I have a problem directing air flow to the floor, it seems to always go to the defrost. It blows a lot on top and very little out the bottom. It will do this on Automatic, and on Manual selection. Fan motor blows ok. I was told it could be a vacuum motor which operates a damper or door to direct the flow. Do I have a Vacuum Pump, could it be not enough Vacuum to operate the device? If it exist where is it located? If not where does the Vacuum come from, or am I on a goose chase.
The unit is Climate Control, everything else seems to function ok.

Any information will be appreciated

Thanks
Captain Don

[BroncoJoe19]

No vacuum pump, it comes from the engine.
You are correct to suspect a vacuum leak.
It may be in the engine compartment, under the dash (at an actuator, or quite possibley in the switch.

Here is some info, good luck tracing it down.

http://www.ford-forums.com/ford-taur...html#post75988
WIndstar rear heat issues
http://www.ford-forums.com/ford-wind...html#post55494

Econoline Rear Heat A/C How To
http://www.ford-forums.com/ford-econ...tml#post131707

Here is a vacuum pin out for the switch for the direction of the front ductwork, ie floor, dash, or defrost venting for a '99 windstar.
http://www.ford-forums.com/heating-a...html#post89661

[Captain Don]

Thanks BroncoJoe, this information was helpful. I have some testing and studying to do, I'll let you know what I find.

Thanks again
Captain Don

[BroncoJoe19]

You're welcome, if you get stuck, pictures may be helpful.
Good luck.