No Heat / Blend Door Tap

Discussion in 'Heating & Cooling' started by Caleb Boyer, Nov 2, 2019.

  1. Caleb Boyer

    Caleb Boyer Member

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    Hi all. 2003 expedition with 5.4 L
    Winter is almost here, I have no heat. Been noticing a tapping when I change temperature, which goes away after a while. I just replaced thermostat, and engine temp is good. I replaced the blend door actuator, but still have a tapping noise and still no heat.

    Is there more than one blend door? As in a separate one for heat and cool, and separate one that changes direction of air? Air will change from vent to floor and defrost just as it should. AC blows cold, and works great from rear air vents in roof as well, but no heat from front or roof vents what so ever.

    my thoughts are either another blend door I’m not aware of, or flushing heater core.

    the blend door I replaced was the one under the radio, on top of the AC Box
     
  2. aagitch

    aagitch Well-Known Member

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    It's your actuator that adjusts your cabin air temp. Not sure which one that is though. I had the rear one go bad on my 2003 and it made a tapping noise as well.
     

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