Toyota Trucks: Toyota Thermostat bad?

The upper hose is supposed to be hot. That's the hot coolant from the heads
going through the radiator for cooling. The lower hose is supposed to be
cool. That's the cool coolant going to the engine. The thermostat diverts
just enough coolant through the radiator to hold a constant coolant
temperature in the heads, and in the winter that won't be much. If your
temperature gauge is rising from cold to normal at the usual rate, and it
holds at the normal point on the gauge as it should, your t'stat is OK.

Your warm heater could be a couple of problems. Check that the hot coolant
valve is really opening all the way. Check that the coolant level is OK.
Check that the air passages are clear. Have someone show you how to
disconnect the air conditioning when you're using defrost. Unlikely that
you have a clogged heater core on a 2000.

Ken



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