Good evening.
It sounds like the blower resistor is defective. That is what controls the blower speeds.
Roy
1. Disconnect the electrical connector from the blower motor resistor.
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2. Remove the blower motor resistor screws from the HVAC module.
3. Remove the blower motor resistor from the HVAC module.
Images (Click to enlarge)
Jul 17, 2018 at 9:04 AM