RAM 2500 Van V8-59L VIN Z LDC (2000) - Heating and Air Conditioning - Blower Motor Operation
Blower Motor: Description and Operation
Rear
The rear blower motor and blower wheel are located in the optional rear heater-A/C unit housing in the passenger compartment. The rear heater-A/C unit
is secured to the floor panel between the fuel filler inlet housing and the left rear wheel house against the left side panel. The blower motor controls the
velocity of air flowing through the rear heater A/C system by spinning a squirrel cage-type blower wheel within the housing at the selected speed. The
blower motor and blower wheel can be accessed for service from the passenger compartment.
The rear blower motor will only operate when the ignition switch is in the ON position. The blower motor receives a fused battery feed through the
ignition run relay whenever the ignition switch is in the ON position. The blower motor battery feed circuit is protected by a fuse in the Power
Distribution Center (PDC). The blower motor relay control circuit is protected by a fuse in the junction block.
Blower speed is controlled by regulating the blower motor ground path through the blower motor switch, the blower motor resistor, and the high speed
blower motor relay. When the rear blower motor switch is placed in the highest speed position it energizes the high speed blower motor relay, which then
provides a direct ground feed to the blower motor and bypasses the blower motor resistors.
The rear blower motor and blower motor wheel cannot be repaired and, if faulty or damaged, they must be replaced. The blower motor and blower wheel
are each serviced separately.
