Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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the first thing I would dois the obvious. check the coolant level and make sure the thermostat is working.
check the heater hoses. they must both be hot to the touch. if one is hot and one is cooler, then the core is clogged and needs to be flushed out. you can use a garden hose and flush back and forth several times until equal flow in both directions.
having a scan tool is the best way to verify that the blend door is moving correctly.
can you hear the door moving going from hot to cold and back???
how are you making out