Sprinter 3500 L5-2.7L DSL Turbo (2004)
Blower Motor Switch: Description and Operation
The blower motor is controlled by a thumb wheel type blower motor control, mounted in the A/C-heater control. The switch allows the selection of four
blower motor speeds with the ignition switch in the On position.
NOTE: The blower motor will operate only at the lowest speed when the Residual Engine Heat Utilization (REST) function is selected, regardless of
the blower speed setting on the A/C-heater control.
When the ignition is turned to On, the integral blower motor resistor within the ATC A/C-heater control supplies power to the blower motor switch. The
switch directs power to the individual blower driver circuits through the blower motor resistor block to the blower motor and then to ground.
The blower motor switch cannot be adjusted or repaired, and if faulty or damaged, the A/C-heater control must be replaced.
