With Electronic Automatic Temperature Control (EATC)

BLOWER MOTOR SPEED CONTROL

The blower speed control:
- is located on the heater core and evaporator core housing near the blower motor.
- converts low power signals from the EATC module to a high current, variable ground feed for the blower motor.
- varies the blower motor speed and is controlled by the EATC module software.
- has a delay function to provide a gradual increase or decrease in blower motor speed under all conditions.
- controls the integral high blower speed relay which is engaged when maximum fan speed is selected.