Heater Wont Work!! Need HELP!!!

[jsexton]

I have a 2001 f250 7.3lt 4x4 and I cannot haul my kids because my heater has stopped working. I have replaced the radiator, waterpump, thermastat 3 times(latest one from ford for $50!), flushed system, blew out the heater core, put a vacuum pump off of my dad 350 on it, and it still will not heat. Well, it will heat now when rpm is over 1500 or while driving, but if i stop and let the truck idle the vents just blow cold air. Sometimes you still loose heat while driving. I will appreciate any help im over my head and this is my first diesel! Thanks!

[Dave]

Does it heat if you switch it to defrost?

[jsexton]

No but if i lock it in 4 wheel drive, it switches from vent to defrost. I put my dads vacuum pump on it and they both pull vacuum but the heat still wont continue to work.

[Young-SC-Owner]

J, when you switch to 4X4 it uses a vac solenoid, Means your leaking vac somewhere between the canister and the hubs. Sorry I cant help you with the Heat issue

[jsexton]

I found the problem with the vac lines to the hubs. I had to rplaces the lines, both were dry rotted. Still no luck with the heat problem. I can bleed off the air in the coolant system and the heat starts working, when i drive it down the road and pull over and let it idle again it has more air to bleed! Any ideas?

[jsexton]

Thanks for all the help guys! I replaced the heater core and that seems to have fixed the problem with my heat! Now i took it to the ford dealer for 2 recalls and the y called me and said that i needed a front hub assembly and i had an oil leak from my icp sensor. They want 250 for the icp sensor and 700 for the front hub assembly! I found them both on ebay the hub for 90 and the sensor for 75. Has anyone had luck with getting parts off of ebay?