heater probelms PLEASE HELP

[cjenne25]

I've got a 99 F250 and the ****ing heat won't work. the blower is good, the heater core is hot, but it won't blow out hot air only cold. i went and bought a new temperature control unit, it worked for a few days then stoped. the ALL of the fuses in and out of the truck are good. any suggestions.

[BIGGER]

Either the blend door motor or blend door itself.

The motor sits above the heater core. Once you pull it off and test it, you will be able to tell where it attaches to the door itself.
Motor mounted.

Motor

[cjenne25]

Do you have to pull the dash out or just fold the glove box down..

[BIGGER]

Originally Posted by cjenne25

Do you have to pull the dash out or just fold the glove box down..

Just drop the glovebox down and you have plenty of room.

[cjenne25]

Originally Posted by BIGGER

Just drop the glovebox down and you have plenty of room.

thanks man! i appreciate the info, took it off and it was working, so i put it back on and started working kinda weird but thanks again...

[grabowskimech]

You might want to try and check if something fell down the defrost vents and is blocking the blend door. I've seen this happen many times and have recovered pens, small wrenches, hairclips, etc... that were blocking the blend door. Do your usually have a bunch of stuff riding around on your dash? If you do, this might be your problem.

[matts7.3]

does it blow out in your front vents or just the defrost? It may be a vaccum issue? I may be completely wrong about with the heater, but mine it looks like everything is controlled off of a vacuum which is also shared with the auto locking hubs unit. hope this helps

[cjenne25]

hey guys thanks alot. I Got it fixed. it was what the first guy said it was. thanks a lot. living here in missouri it get pretty cold in the mornings. thanks a bunch.

[BIGGER]

Anytime