HVAC Blower Controls Circuit Description. Chevrolet Camaro 1999

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1999 🢒 Camaro 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 HVAC Blower Controls Circuit Description

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 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.

HI 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.