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Winter has come here and I am noticing that my truck is not producing heat this year. The defrost on this used to be able to melt an inch of ice of my windshield within minutes. I immediately thought heater core, but noticed something else weird. The gauge for my radiator is hardly budging at all. This I assume is telling me that my Thermostat is stuck open. Does my assumption sound right about the thermostat, and if so, would the fact that the thermostat was stuck open and not allowing the system to heat up be what's not allowing my heater core to heat up?
1991 Toyota Pickup 4-Cyl.  

That would be a good start. Put a 195 in it.