Operation CHARM: Car repair manuals for everyone.

Auxiliary High Blower Speed

When the High (5) blower speed is selected, the auxiliary HVAC control module applies a ground for the auxiliary blower motor. Voltage is routed from the auxiliary blower motor, through the high blower motor control circuit, to achieve the desired auxiliary blower speed. The circuit is grounded by the high blower motor control circuit and auxiliary HVAC control assembly.