Auxiliary Air Speed

WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

Auxiliary heat or A/C has a blower motor that is independent to that system. Voltage is supplied to the auxiliary heater switch or auxiliary A/C switch from the A/C relay in the underhood fuse block. Either the auxiliary heater blower motor switch and/or the auxiliary A/C blower motor switch applies voltage to the auxiliary blower motor control circuit that corresponds to the selected blower speed. The resistors and the blower motor are in a series circuit. The following list represents the number of resistors in series with the auxiliary blower motor per particular speed request:

Low speed-2 resistors
Medium speed-1 resistor

When the operator requests High speed, Voltage is applied directly to the auxiliary blower motor.