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Control Module HVAC: Description and Operation

A/C Blower Motor Control
The blower motor control is a rotary switch which controls the volume of airflow through the climate control system. This switch operates a four speed A/C blower motor mounted under the evaporator/blower unit.

Without A/C
Vehicles without A/C have a single function blower motor switch.

With A/C
Vehicles equipped with A/C have a dual function blower motor switch, which has the A/C switch incorporated within it.