Heating issues on 99 Expedition

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Nov 18, 2021 | 01:09 PM

Shannon360

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Joined: Nov 2021

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Heating issues on 99 Expedition

My mothers Expeditions heater isn’t working. I replaced Thermostat and did a flush of the heater core. When moving the climate dial I can hear the blender door moving and feel more forced air when in the full cold position. So I’m pretty confident the blender door is working. One weird thing I notice is that the ac compressor keeps trying to click on every 30 seconds. I’m stumped, any suggestions would be greatly appreciated.

Nov 19, 2021 | 07:05 PM

pdqford

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From: Central NYS

I believe that the AC is automatically engaged if in the defrost mode to help dry the air going to the windshield.
Is it in the defrost mode?

Nov 20, 2021 | 09:34 AM

alloro

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Quote:

Originally Posted by Shannon360

My mothers Expeditions heater isn’t working. I replaced Thermostat and did a flush of the heater core.

Go take it for a drive on the highway. Often after flushing the heater core gets air bound and the high speed drive moves the coolant fast enough to push the air out. I trust you've felt the 2 heater hoses that go through the firewall and they're not very hot?