Help No Heat

[MNoble]

I just pulled a friends Powerstroke (2001 F250) to replace the leaking oilpan. Did a few minor mods while it was out. (hpx crossover, mbpr 4", whicked wheel) also the the oil pump gasket, front main seal, water pump gasket, ect. It is running like top however, i have absolutely no heat in the cab. The heater lines are cold. I got about 7 gallons of coolant in it. I tok it out on the freeway and was running it at exactly 60 thinking maybe some rpm willl work out an air pocket or something. Suddenly the temp began to rise. got almost to the H on the guage, I pulled it over shut it down opened the hood. everything looked fine, upper hose had no pressure and was not hot. coolant level fine. I went back in the cab and turned on the key the guage was back at the normal point. I started it up and drove it home the temp never budged past normal on the way back (however, I didnt push it past 50 on the way back). Still no heat. Im stumped. Thermostat? any ideas and help will be greatly appreciated.

THANKS,
Mike

[Dave]

hopefully one of the techs will see this and be able to help you out

[regor]

Sounds as though the thermistat got stuck on it, but thats my 2 cents.. Hope you get it worked out.

[lilredpowerstroke]

Sounds like you need a new t-stat!!!!!!