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Originally Posted by johnny192
I thought my heater controller in my truck was going bad..... If it was on hot, I couldnt switch it to cold or the other way around. I bought a new controller and I STILL have the problem. its now 7 degrees and I have no heat. I was asking around and it could be the heater core but I had no leaks in the passenger floor. some say it could be the damper or even the radiator needs to be flushed. I did look under the hood and saw some antifreeze near the T stat. The truck doesnt overheat. ANY input on this would be greatly appreciated.
john
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First, check the heater hoses and see if the coolant is flowing through them. You should be able to tell by feeling them. Next, is your engine getting up to operating temperature?
If the thermostat is working properly (guage is indicating normal) and the hoses are hot (both) you may have a door problem.