Posted by 4play on October 19, 2020 at 22:44:38 from (158.62.139.32):
In Reply to: 06 f150 heat issue posted by Plowhand on October 17, 2020 at 08:14:14:
No cabin air filter on this model, Keep in mind, the only difference in MAX mode is the HVAC is recirculating cabin air in the MAX selection, and outside air when not in MAX. Drawing in outside air is usually not as efficient because you are trying to heat up cold air all the time.
The two things I would still want to verify is if the heater core is partially restricted, or if the temp door is actually moving all the way open/closed. If the heater core is partially restricted, usually this is noticed as cool or warm air at idle speed and hotter when RPM is raised up. Sometimes you can take the heater hoses off and back-flush the core with a garden hose, if not a heater core replacement might be needed.
I have found all kinds of junk fall into the HVAC box from people throwing things on top of the dash and dropping through the Defroster grill ( coins, screws, pens, bullets etc. ) these things can prevent doors from sealing when open/shut. This can be difficult to verify since you would most likely have to pull the dash and split the HVAC case to be certain. I would exhaust all other options before this one. The spline part of the door
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