Electronic Climate Control

Blower Controls
The blower speed is automatically controlled in the automatic mode. You can manually select it by repeatedly pressing the blower speed button. The more times you press it, the faster the fan goes until it reaches maximum speed.

Battery voltage is applied through fuse 12 to the blower motor relay contacts at all times. With the ignition switch in ACC (I) or ON (II), the blower motor relay in the under-hood fuse/relay box is energized which feeds battery voltage to the blower motor. The power transistor controls the blower motor in all speeds except HIGH. The power transistor is controlled by the climate control unit. When the control unit requests HIGH blower speed, it grounds the blower motor HIGH relay coil, energizing the relay, which connects the blower motor directly to ground, making the blower run at high speed.

In cold weather, the blower will not come on automatically until the heater starts to develop warm air.