hi everybody, this is my first post. I have a 99' F-250 ext cab 4x4 with 5.4 ltr triton. i have no heat. i have been reading through the forums searching for someone that has the same problem as me and this is the only one i have found that sounds similar http://www.ford-trucks.com/forums/686323-lost-heat.html. The blower motor is working fine, both heater hoses are getting hot, i replaced the thermostat, and the a/c is working fine. I am not used to working on Fords, but i am fairly mechanically inclined (work mostly on chevy's, sorry i know). It sounds to me like i am having an issue with either my temp control switch, or the actuator that moves the duct from hot to cold. Now i know that the HVAC control panel is the same as they use on sterling trucks and those things go out all the time but its usually the blower motor control that fails. but my question is, where is the actuator at that controls this particular piece of duct, there are a few different actuators on this thing, some vacuum some electric.
Thanks man i got to messing around with that thing and it was the servo under the dash above the transmission tunnel. the thing is locked up, and the blending flap (i think that is what you call it) is broken into pieces. I got what is left of the flap turned over to heat, i poked a little hole in the duct and used a small piece of wire coat hanger to push it over and hold it in place. I know thats a half-a$$ fix but untill i can get the time to pull the dash out and replace all of the broken parts it will work. Thanks for the help, i've found that there are a lot of helpful people out there on different forums and you guys seem to be no exception to that. I am a new member here i'll try to contribute when i can, with what little knowledge as i have about fords. and again thanks for the help. if anyone needs to know exactly what i done to temporarily fix my problem just reply to this post and i'll be happy to describe in detail.