LO-M2 Positions
HVAC Blower Controls Circuit DescriptionLO-M2 Positions
When the ignition switch is in the RUN position voltage is applied through the HVAC Fuse 6, circuit 241, to the HVAC control selector switch. When the selector switch is switched to any position, except OFF, voltage is supplied to the blower switch through circuit 66.
When the blower switch is in the LO position voltage is applied to the blower switch, to the blower resistor through circuit 60, to the blower motor relay through circuit 101 and then to the blower motor through circuit 65. The blower motor receives ground at all times through G201, circuit 850. When voltage is applied to the blower motor, the motor runs at low speed.
When the blower switch is switched to M1 or M2, the blower control system works as described above except for the speed of the blower motor. The blower motor has several resistors that voltage flows through to get to the blower motor depending which position the blower switch is in. In the LO position, voltage passes through 4 resistors. In the M1 position, voltage passes 3 resistors and in the M2 position voltage passes through 2 resistors. As the resistance is decreased the blower runs at a faster speed.