majohns

whats causes you air to blow through the defrost duct? defrost, vent, a/c everything blows through the defrost vent at the windshield. any ideas???

torkum

When you have a vacuum loss the system defaults to defrost. Check the fitting that goes into the firewall behind the battery. It tends to break.

majohns

ok it goes into the fire wall right?

majohns

i see a little line that goes through a big hole in the firewall and it comes up to a T and oneof those hoses goes to another T. all of them look good

mwmotorsports49

i am a new member and noticed this post....Are you still looking for a solution to fix your problem? Does your truck have the EATC which is the electronic climate control? in other words all push button and no *****. if so i can help you out.

majohns

yes all push buttons and no ***** except the little roller that turns the fan up and down

mwmotorsports49

http://www.f150online.com/forums/hva...buildable.html

see if this link helps anyone with there climate control. it fixed mine.