Air Speed

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

The blower motor circulates air through the vehicle's interior. The vehicle operator determines the blower motor's speed by placing the blower switch in one of the following positions: Low, Medium 1, Medium 2 or High. The blower motor will always operate in any switch position other than OFF, as long as the ignition switch is in the RUN position. The blower and mode switches are located within the HVAC control unit. The blower motor is housed in the blower case which is located behind the right side of the instrument panel.

The coil side of the heater relay receives ignition voltage through the GAUGE fuse when the ignition switch is in the ON position. When the blower switch is in any position other than OFF, the coil of the heater relay is provided a path to ground through the blower switch to G200. The switch side of the heater relay receives battery voltage through the heater fuse at all times. When the ignition switch is in the ON position, and the blower switch is in any position other than OFF, the heater relay is energized and provides battery voltage to the blower motor. The blower motor speed is maintained by controlling the voltage potential to the blower motor. This is achieved by increasing or decreasing the resistance within the blower motors ground path.