2500 4x4 Pickup V8-318 5.2L Magnum (1995)
Blower Motor Switch: Testing and Inspection
The blower motor switch is only serviced as a part of the heater-only or heater-A/C control assembly.
1. Turn the ignition switch to the Off position. Remove the heater-A/C control from the instrument panel. Check for continuity between the ground
circuit cavity of the control wire harness connector and a good ground. There should be continuity. If OK, go to Step 2. If not OK, repair the open
circuit to ground as required.
2. With the heater-A/C control wire harness connector unplugged, place the mode control switch knob in any position except the Off position. Check
for continuity between the ground circuit terminal and each of the blower motor driver circuit terminals of the control as you move the blower
switch to each of the four speed positions. There should be continuity at each driver circuit terminal in only one blower motor switch speed
position. If OK, test and repair the blower driver circuits between the control connector and the blower motor resistor as required. If not OK,
replace the faulty heater-A/C control unit.