I am having trouble with the temp dial **** on my F150 HVAC control. It will still blow hot air when in the blue section and cold air sometimes when in the Red section. Is anyone else having this problem ? It is very tough to balance the temperature !!

 

Make sure the **** is securely attached to the post. Sounds like the **** is slipping.

 

the baffles in the hvac system are controled by little servo motors, the one that controls the temperature could be sticking causing an intermittant problem, thats where i would check first

 

I have the same problem, I think the post is stripped. I'm try to find information on the difficulty of replacing the whole thing (rheostat)