Hey guys ! I have a 2001 F150 4x4 with a 5.4 . The heater is not working correctly. It only provides a minimal amount of heat thru the vents on low fan . The other positions don't work at all . Floor, defrost, etc. Any help would be appreciated.

James

 

James- dont quote me on this, because ive never been into one, but there is blend door actuator, i believe its down low behind the cover that sets between the bottom of the dash and the transmission hump- i remember something about it from a youtube video on the heater core
Im sure someone whos actually been into one will be more enlightening!- or try to find a youtube video- sorry i couldnt be of more help, but it might give you a start.

 

Ok...thanks

 

Replaced heater blend door and motor . The blend door was not broken however . Just went ahead and changed it out . Still no heat . Is there anything on the engine side of the firewall that may be causing this ? Relay or something . I can put my hand over the heater core from inside the box that I cut open and its still cold at operating temperature. Any ideas ?

Thanks

 

Is your coolant level good?

 

James- again,i havent had to do many repairs on our generation trucks(thats a good thing)- some of my old Fords had a vacuum operated valve in one of the heater hoses to control flow.
Failing that, check your thermostat- make sure your engine is coming up to temp.

 

Thermostat, plugged hose, or heater core, and water pump come to mind. Your blower problem very well may be the resister. That is cheap, and easy if you don't have automatic temp control.

 

The blower is working fine . The engine is slow to warm up . I will check the thermostat . The water pump does not appeal to have any issues. Not leaking and coolant is moving inside the radiator.

Thanks

 

I remember those vacuum valves. Had a 77 and a 79.

Thanks