I’m a pretty handy guy and have been working on my own vehicles as well as projects for years but this one has me stumped. My daily driver (2013 f150 limited 3.5 eco boost) just lost heat in the cab. Coolant level is good, coolant system is holding good pressure, and no overheating while driving. Heater is blowing cold outside air but the fan does kick on as it should. Blend motors seem to be working because I am still able to switch which vents run as well as at what speed. Is there some other module or controller that controls when the heater core actually starts heating air? Or what am I missing?

TL/DR: heater no worky, coolant system worky, what wrong

  • Opening_Price_2444@alien.topBEnglish
    1·
    10 months ago

    If the blend doors are working then the heatercore isn’t getting hot. Either its blocked but that generally would cause the air to not be very hot not no heat at all. Im not familar with the car but I would guess it runs a heater tap that isn’t actuating.

  • cstephenson79@alien.topBEnglish
    1·
    10 months ago

    Feel the hoses under the hood where they go into the heater core at the firewall. They should both be warm/hot. If ones hot and one cold you’ve got a plugged heater core. Can try flushing but heater cores aren’t uncommon on those to go bad.

    • Ok-Formal5645@alien.topOPBEnglish
      1·
      10 months ago

      With a plugged heater core, wouldn’t I run into overheating issues as well? I’ve always seen those two issues come together