No heat front or rear

1999 FORD EXPEDITION
150,000 MILES • 5.4L • V8 • 4WD • AUTOMATIC
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SAE02232GMAIL.COM
  • MEMBER
  • 1 POST
I have no heat coming from the front or rear. I have flushed the entire cooling system, i have blown out both heater cores with water and air, both ways forward and reverse. i replaced the water pump, the thermostat. previously i had replaced the front blend door for no heat in the front about 2 months ago and everything worked great until 2 weeks ago. I even packed cardboard in front of 3/4 of the radiator, now when i drive it tries to get lukewarm but at idle it goes cold immediately. the top radiator hose doesn't get hot which tells me the thermostat is stuck open. i just replaced bit 2 days ago. i thought about changing it out again, but i am getting frustrated. i have been a professional master technician for 40 years, i can't even read ECT with my Snap On Modis. all i can seem to find is cylinder head temperature and that value is measured in volts and it seems to be within specs.
Nov 20, 2020 at 1:02 PM
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ASEMASTER6371
  • Experienced Mechanic
  • 52,796 POSTS
Good morning,

Did you check the temperature of the heater hoses going it and out of the cores to be sure there is circulation?

https://www.2carpros.com/articles/car-heater-not-working

I would start there.

Can you hear the blend door move back and forth when you command heat and cool?

https://www.2carpros.com/articles/replace-blend-door-motor

I attached a YouTube video for the front blend door.

https://www.youtube.com/watch?v=Yom1h8CCuzU

Roy

REMOVAL

NOTE: The auxiliary blend door actuator is shown; the auxiliary mode door actuator is similar.

1. Remove the LH quarter trim panel.



imageOpen In New TabZoom/Print



2. Remove the electronic actuator.
1 Disconnect the connector.
2 Remove the screws.
3 Remove the electronic actuator.

INSTALLATION
1. To install, reverse the removal procedure.
Nov 20, 2020 at 10:17 PM
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