It can be not enough coolant. Check the coolant level. Also the regulator can be at the position than car takes air form outside not inside. Have it checked too.
Good Luck
I have the same problem in an 1995 and 2000. Heatercore, hoses, radiator, and thermostat have all been replaced. still nothing but lukewarm air... are these hvac controls controlled by vacuum or electronics?
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Is the trucks temp. gauge getting up to normal operating levels? Around 200 F should be in the ballpark
How cold is it right now where you live?
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