Blower Switch
Blower motor is controlled by a 5-position blower switch. See Fig 1. Blower switch starts with off (zero) and progresses to position No. 4 for high speed. Blower switch is turned off by rotating switch fully counterclockwise to off position. 3 lower operating speeds are obtained with a blower motor resistor, connected in series with blower motor switch, operating on negative side of A/C blower motor. High speed operation by-passes blower motor resistor.