Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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The biggest cause for this fault here is the blower motor resistor/control unit that is located on the heater box under the dash on the passenger side near the blower motor itself.The wires from the blower motor lead to it.GM had even released a bulletin to replace this resistor as well as the connector for it for this issue here.
If you have a test light I can try and walk you through this just let me know.You can also unplug its connector and checked for burned and damaged terminals as this will tell you for sure that it and the connector need replaced.A local dealer and even parts stores in your area carry both due to the common failure of the connector and resistor.
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Sounds like bad motor possibly.In some cases you can tap on the bottom of the motor and if it runs when this is done and key on with fan on then this indicates the blower is at fault needing replaced.I can also tell you how to test this if you have a multi meter or test light to test with just let me know.
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