PIN 1883351 - Caterpillar

Illustration 1 g00645955
Remove screws (A) and filter screen (B). Also remove the air filter.
Illustration 2 g00645860
Note: The speed control is located inside the air conditioner and the heating unit. The electrical connections for the speed control and the blower motor are accessible through the location of the air filter.
Start the engine and turn the air conditioning system ON.
Illustration 3 g00333238
(1) On/Off switch (2) Automatic temperature control switch (3) Air conditioning override switch (4) Temperature selection switch (increase) (5) Temperature selection switch (decrease) (6) Preset temperature display (7) Indicator display (fan speed) (8) Fan speed override switch (decrease) (9) Fan speed override switch (increase) (10) Air inlet selection switch (fresh air) (11) Air inlet selection switch (recirculated air) (12) Air outlet selection switch (defroster) (13) Air outlet selection switch (under seat) (14) Air outlet selection switch (upper body and under seat) (15) Air outlet selection switch (upper body)
Illustration 4 g00781373
(Fan speed knob and Power on switch) (Automatic temperature control switch) (Air outlet selection switch) (Fresh air control) (Temperature control knob) (Display)
If your machine is equipped with the control panel in illustration 3, refer to step 4. If your machine is equipped with the control panel in Illustration 4, refer to step 5.
Press fan speed override switch (increase) (9) until the highest fan speed is displayed. Continue to step 6.
Rotate the fan speed knob (1) until the highest fan speed is displayed. Continue to step 6.
Check for supply voltage (25 V) at the blower motor on wire C585-BR. Do not disconnect the electrical connector for the blower motor. Use 8T-3224 Needle Tip (Multimeter) in order to measure the voltage.
Continue to monitor voltage. Press fan speed override switch (decrease) (8) until the lowest fan speed is displayed.
If voltage changes within the specification range (25 to 13 volts), the speed control is operating correctly.
If voltage does not change within the specification range, perform the Testing and Adjusting, "Control Module - Test".