Ok, my heater works intermittently. What I mean by that is that if I crank it and let it sit, the heater doesn't start blowing until I have driven it for around 20 minutes or so. It is hot, but doesn't seem to want to blow until the truck gets going for a while. Is my blower motor going or what? Any good suggestions?

 

Welcome to FTE!!

I would check the voltage at the blower motor with it set on high and then pull the motor and check for proper operation and trash in the plenum if you don't get any air flow.

 

sounds like a bad thermostat.