Blower Motor: Description and Operation

With the starter switch in START and the transmission control lever in PARK or NEUTRAL (automatic transmission), or with the clutch pedal depressed (manual transmission), voltage is applied to the starter relay and the relay energizes. When the starter switch is turned to ON with the engine running, the relay de-energizes and voltage is applied from the generator to the heater and A/C relay through the normally closed contacts of the starter relay. The heater and A/C relay energizes allowing voltage to be applied from FL-1 (MAIN) fusible link to the blower motor through fuse C-19.The blower switch then applies ground to the blower resistors for the desired blower motor speed. As the blower switch moves from OFF to position 4, resistors are bypassed. As the resistance to ground is decreased, blower speed increases. When the blower switch is in position 4, all of the resistors are bypassed and the blower motor runs at the highest speed.