2002 Ford F-150 Heater Not Working

My 2002 Ford F150 blows barely warm air. I have flushed the fluid, changed the thermostat, and checked blend door operation, but no change. The upper heater hose is warm, but I still do not get heat regardless of the RPM of the engine, no heat. The A/C works perfectly.

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February 10, 20180 found this helpful

There are a lot of people who experience this problem.

Here is the forum with lots of solutions: https://www.thr  Not-Working.html

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February 13, 20180 found this helpful

Thank you. I have read many forums, including this one, on this and checked every possible solution suggested, but no luck yet.

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February 11, 20180 found this helpful

You could have a problem with one of the blend door actuators. https://www.goo  in-cabin-841.amp

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Anonymous
February 12, 20180 found this helpful

Nope, I have cut the heater housing open and watched the blend door moving. It seems to be fine.

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February 13, 20180 found this helpful

I'm thinking there is air in the system like my Lincoln. I ran the front end up on ramps then loosened the reservoir cap. Then I squeezed the upper radiator hose and the air bubbled up into the reservoir.

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Refill the reservoir fluid to level. Tighten down the cap. Or, don't always trust the new thermostat. I have returned so called new ones because they were defective.

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February 14, 20180 found this helpful

Thanks. The air bubble was a possibility. I have ran the truck on some steep inclines with a full reservoir. Removed the upper heater hose and pressurized the reservoir to see if I could push air out of the heater hose, all to no avail.

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