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I've got an '05 F250. While driving down the road the heater blows hot air. While idling the heater blows cooler air. I'm thinking it's a partially plugged heater core. Anyone else got an idea? The engine coolant temp stays steady dead center of the temp gauge. The engine warms up normally then...

What controls the alternator charging cycle? I've got an '05 that I can't tell if it's charging correctly. Right now I can only check the system with a multimeter while the truck is sitting still, but I don't think it's charging correctly. The most I've seen is 12.5 volts. This is with the...