HI Position
HVAC Blower Controls Circuit DescriptionHI Position
The HI position in the blower switch works differently than the LO-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 moved to the HI position voltage is applied through the HVAC control selector switch to the blower motor relay through circuit 52. The blower motor relay receives ground through G200, circuit 650 at all times. When voltage is applied through circuit 52 the solenoid within the blower motor is energized closing the internal switch within the blower motor relay. Voltage is always applied to the relay through the IP 1 MaxiFuse, circuit 1202. When the internal switch is closed voltage is applied to the blower motor through circuit 1202, blower motor relay, and circuit 65. This causes the motor to run at its fastest speed due to that the voltage does not have to travel through a resistor. The blower motor receives ground at all times through G201, circuit 850.