ford f150 blows out vent only

[homerun]

2003 ford f150 only blows air out vent only. will not switch to floor or defrost. when switch to these spots it still blows out vent. any suggestions. thanks

[fishbowl365]

http://www.ford-trucks.com/forums/index.php

[davidluster]

Vacuum leak or the a/c dash unit is bad. My F150 would only blow out of the defrost. I went to a used part place and they let me borrow the dash control and switch them out. That didnt fix it so i started looking for a vacuum leak. I think with a vacuum leak then it goes to just defrost so i would guess your problem is dash unit is bad. My wife's jeep did exactly what yours is doing and i replaced the dash unit and fixed it.

[carryyourbooks]

my bro is a ford mechanic in richmond and works in stafford. let me know if you want his info. he might be able to tell you what is wrong with it and/or suggest whether or not it is something you can fix or something better left for a professional.

[CopanoCruisin]

On my '92 it was a vacumm leak under the hood, on the firewall reght in front of the steering wheel. best of luck.