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So I plugged my truck in last night for the first time ever since I bought it. This morning it only took 5 minutes to warm up, but my heater is only blowing cold air. I am guessing its a thermostat but could it be anything else?
2002 F-250 with a 7.3.
If it was the thermo stat you wouldnt have seen the truck heat up.
I can only think of a couple of things,
1st, are you putting the right coolant in the truck, sorry I have to ask, but coolants dont always like each other and will do some kind of jelling. Happens to GM's a lot when they are supposed to have the dextron, and someone throws in the wrong stuff.
The next thing I would be looking at would be the blend door control and then the motor..