Under air the cleaner housing, under hood front driver's side.
You probbably have controler problems but the resistor is on the evaporator case.
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On the bottom of the car
blower motor blows hot or cold air over evaporator
As you face the car, on the right (driver side) in front of the engine is an air pump, a vertical canister device on a large metal bracket. the sensor is at the bottom of this assembly. You can trace the wires on the right side of the canister/pump.