I have a 2008 150. I can't seem to get the heater to stay at a comfortable temperature.fficeffice" /><O></O>
I set in on 60 and its too cold, the next setting is 65 and its way too hot. I’m sure it’s hotter than 65.<O></O>

 

TSB 08-23-6. Some 2005-2008 F-150 and 2006-2008 Mark LT vehicles equipped with Electronic Automatic Temperature Control (EATC) may exhibit intermittent periods of warm air output in Auto mode with the temperature control set between 68-72 degrees Fahrenheit (18-22 degrees Celsius). Some 2005-2008 F-150 vehicles equipped with Electronic Manual Temperature Control (EMTC) may exhibit periods where the cabin temperature cannot be maintained with the control ****. Some customers may also complain the heat cannot be reduced without rotating the control **** well into the Cool/Blue range. The condition may be caused by a faulty temperature blend door actuator. NOTE:THE IGNITION KEY MUST BE OFF WHEN REPLACING THE ACTUATOR. ENERGIZING THE ACTUATOR BEFORE INSTALLATION ON THE HEATING VENTILATION AIR CONDITIONING (HVAC) CASE WILL CAUSE THE PART TO BECOME MISS POSITIONED AND CORRECT ORIENTATION WILL BE LOST. INCORRECT ACTUATOR OPERATION MAY RESULT

I had this TSB performed for the same problem. It is an easy fix but often misdiagnosed as a faulty climate control head unit so be sure to be specific and reference this tsb when going to the dealer.

Also listen for a buzzing/clicking noise from the climate control area with the HVAC is off and the radio is off while at idle. This noise is commonly heard when F-150s are in need of this TSB however the noise tends to come and go.

Goodluck!