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I agree.

Heat works!! After flushing the heater core and running it hard down the freeway, it started working. Thank goodness. I REALLY did not want to change heater core.

01 F160. 6 cyl. I flushed the system today. Still no heat. Took air hose to the heater core inlet and outlet. Blowing the outlet hose went well but the inlet did not act like I was getting anywhere...

I thought it may be stuck open since the hoses were not hot but temp gauge reads normal. Not losing any fluid anywhere.

Blender door works, new thermostat, heater hoses are only warm after driving for an hour, top radiator hose is hot but I can hold on to it for a while. Haven't flushed the system yet, should that be...

I will check vacuum and try to flush the heater core. I'll let you know what I come up with. Thanks a lot. Ice storm in Memphis right now so have to tackle it this weekend.

Sorry. Meant heat is ONLY blowing cold. Saving heater core as last resort. Going to check everything else first but thanks for the response.

Thermostat working, blender door working, don't see a heater control valve on this truck. 2001 f150.