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Sorry I had to leave. I am back now. My S-10 is a 2WD with a 4.3L TBI engine. I will check my email tomorrow morning (1/4/13) for your answer. Thanks
Both of the main hoses are getting hot, and the heater outlet hose gets warm, but that is probably just heat from the engine. The heater inlet hose gets warm near the front of the engine, but the farther back, the cooler it is.
OK your answer makes sense. I found it very complicated to get the answer, but maybe I am just computer illiterate. Thanks
If I am entitled to more than one question, how about the procedure for replacing the heater core?