it sound like the blower motor resister
The blower motor resistor is mounted to the heater-A/C housing, under the instrument panel and just inboard of the blower motor. It can be accessed without removing any other components.
- Disconnect and isolate the battery negative cable.
- Unplug the blower motor resistor wire harness connector.
- Remove the screws that secure the resistor to the heater-A/C housing.
- Remove the blower motor resistor.
To test the blower motor resistor, unplug the resistor wire harness connector. Each blower motor switch
input terminal on the resistor must have continuity to the resistor output terminal, which is connected to the circuit going to the blower motor
. If the blower motor resistor continuity does not check OK, replace the faulty resistor.