Truck heating question

[Wes]

2007 F150.
Been having some issues with the temperature mixer for a while. Sometimes works properly, other times it’s all over the place. Y’all are going to think I’m crazy, but the temperature jumps all over the place when I hit a big bump. I can hit a bump or jam the brakes and it gets much hotter coming out of the vents. I then have to make adjustments to get it right again. Water level in the radiator is good. No other issues besides the mixer. Anyone ever changed the mixer? Easy job?

 

[a_kelley]

1.1 hours, so it shouldn't be too bad.
Remove radio, pull down glove box. Remove 3 screws & unplug connector. Installation reverse of removal.

 

[rodney eppes]

Maybe a door has come loose, or not getting proper connection, for some reason. Sound like you got to go into it regardless.

 

[Caver Dave]

Since the locations (floor/vents/defrost) are vacuum controlled, is the temp range also controlled that way?

 

[a_kelley]

No temp range has an electric actuator.

 

[Wes]

No temp range has an electric actuator.

I can hear the actuators making a weird noise when changing vents. Going from upper vents to defrost sounds like a door opening in a haunted house.