Control Module HVAC: Description and Operation

FIG. 18 Variable Blower/Controller High Blower Relay:

The A/C blower motor speed control is located in the A/C evaporator core housing and is accessible through the engine compartment.
- The function of the A/C blower motor speed control is to convert low power signals from the EATC assembly to a high current, variable ground feed for the blower motor.
- A/C blower motor speed is infinitely variable and is controlled by the electronic control assembly software.
- A delay function provides a gradual increase or decrease in A/C blower motor speed under all conditions.