useroff150

Hello,

In my 1999, 4.6L V8 F150, when I turned on the AC this past summer, I got heat regardless of the setting, and now in the winter, when I set the temperature to heat I get cold air. I get some hot air only when I place the control **** on "PANEL".

Any Ideas of where to start checking?

Thanks.

JackFunTeach

+1 on any ideas. Mine is a 2000, 4.6L V8 F150 Manual, essentially the same vehicle. My AC is not working either. Any ideas would be appreciated as well.

Jack

Marc D

The most common failure on both trucks is the "Blendoor" in the A/C-Heater box. I would check the actuator for this door under the dash, first. If it works then the door is broken at the pivot shaft. Here's the bad news, complete removal of the dashboard is required to fix this issue. I did mine last year and it took about 12 hours in/out. There's a great U-Tube video on this repair "realfixesrealfast/f150 heater core"

sullyman

+1 on the blend door. Likely stuck, or maybe even wired in wrong.

nbrowser

Could also be the blend door motor, they fail quite nicely, sometimes they stop working, sometimes it's like the polarity got reversed...easy fix though if it's just the motor.