Air Speed: Notes
WARNING: This page is about a different car, the 2003 Pontiac Sunfire and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
The heater blower relay is controlled by ignition 3 voltage circuit. Voltage is supplied from the heater blower relay, to the blower motor through the blower motor voltage supply circuit. The HVAC control assembly applies ground to the 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 blower motor per particular speed request:
- Low speed-3 resistors
- Medium 1 speed-2 resistors
- Medium 2 speed-1 resistors
When the operator requests High speed, the HVAC control assembly applies ground directly to the blower motor through the high blower motor control circuit.