Trying To Figure Out Why My Heater Is Not Working. I Do Not Think It Is My Heater Core Because It Is Holding Anti-freeze Fine And Is Not Over Heating. The Truck Is Running At Perfect Temperature But The Heater Is Not Warming At All. If Anyone Has Any Suggestions Please Let Me Know. Thanks Alot

Open the hood and follow the hoses that run to the heater core. You may see a valve lookin thing in one of them, may or may not have a vacuum hose or even a cable runnin to it. This may be the culprit. Could be bad or just the hose or cable has come off or out of whack. Hope this helps ya.

could it b a blown head gasket mine has same problem and someone said it could be that