When we use the heater it sometimes smells like burning wires and smoke is present but I can't find where the problem is. If we turn the heater off it goes away. Wait a minute and start again there is nothing.
Sounds like either your motor or blower resistor is going bad.Gm blower motors tend to go bad from what i have seen.My chevy pickup is on its 3rd motor.There is also a hose that is connected to it that when the air blows it directs some to the motor to keep it cool.You can check that but it is probably your motor
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Great- That worked. Thanks for your help.
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