Hello All, I have a F250XL w/ 5.8. I have all kinds of air flow, but no heat. I changed the thermostat, and it didn't help at all. I can feel the fluids flowing threw the 2 hoses going to the heater core. None of the usual signs of the heater core gone bad, (smell, leaks inside). Also the A/C pump was running constantly(unplugged under the hood). I live in Michigan, and really need my heat back!!

 

check to see if the temp control cable is hooked up and working. it sounds like it is not

 

I assume you are talking about your 1995 F250? If both heater hoses are hot, then there is a problem with one of the doors in the dash. Remove the glove box and the heater core cover behind it. To the left of the heater core is the blend door. While moving the temp ****, make sure the door is opening and closing completely. I often find pens have fallen down the defrost vents and are holding the blend door open. Sometimes you can't even see them, just need to reach in and feel around. Let us know what you find.

Marty

 

Thanks for the info, I noticed that the cable wan't working all the way, so I tore into the duct work, and low and behold!! There was that 29 cent ink pen!!! Thanks agian! Now I have plenty of heat for the winter!!!!

 

I just had the same thing happen to my 97 F-250. Screwed around for a month trying to find things that wern't working and finally found the cover to get at the blend door. Ink pen was it. Glad you got yours working again.