No heat front or rear

Tiny
SAE02232GMAIL.COM
  • MEMBER
  • 1999 FORD EXPEDITION
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
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.
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Friday, November 20th, 2020 AT 9:02 PM

1 Reply

Tiny
ASEMASTER6371
  • EXPERT
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.
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Saturday, November 21st, 2020 AT 6:17 AM

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