DRIVER 1U5842 - Caterpillar

The Blower Motor Does Not Rotate
Diagnostics
If the blower motor rotates only in the HI speed, see Step 2. If the blower motor does not rotate in the HI, or Lo speeds, see Steps 3, 4, 5, 6, 7, 8, and 9.
If the resistor has an open circuit, replace the resistor.
If a fuse has an open circuit, repair the fuse.
If the power up relay of the vehicle is poor, replace the relay.
If the blower motor is poor, replace the motor.
If the blower motor is in contact with the case, repair the motor.
If the blower switch is poor, replace the switch.
If the body ground is poor, repair the ground.
If the wiring is poor, repair the wiring.
If the power transistor is poor, replace the transistor. Normal Air Flow
If the compressor rotation is normal, see "Compressor Rotation is Normal". If the compressor rotation is abnormal, see "Specifications".Compressor Rotation is Normal
If the pressure is normal, see "Pressure is Normal". If the pressure is abnormal, see "Pressure is Abnormal".Pressure is Normal
Diagnostics
If fresh air is entering the cab, see Steps 2 and 3. If the temperature control is poor, see Step 4. If hot water from the heater is being circulated through the system, see Step 5.
Close the window or close the door.
Adjust the damper for recirculation.
Check the actuator for temperature control. If necessary, replace the actuator. Check damper operation. If necessary, replace the damper.
Check the actuator for temperature control. If necessary, replace the actuator. Check the water valve. If necessary, replace the water valve. Pressure is Abnormal
Diagnostics
If high side pressure is abnormally high, see Steps 2, 3, 4, and 5. If low side pressure is abnormally high, see Steps 4, 6, and 7. If high side pressure is abnormally low, see 8, 9, 10, and 11. If low pressure is abnormally low, see 8, 9, 11, 12, and 13. If the high side pressure is high and the low side pressure is high, see Steps 3, and 4. If the high side pressure is low and the low side pressure is low, see Step 15.
If the outside temperature is abnormally high, there is an insufficient amount of cooling.
If the condenser is not being cooled, the condenser could be clogged. Clean the condenser with water.
If the refrigerant is overcharged, remove the fluid until the correct level is obtained.
If the air is mixed in the freezing cycle, evacuate the refrigerant. Refill the refrigerant to the correct level.
If the compression is poor, check the gasket at the head of the compressor for breakage. If necessary, replace the compressor. Check if the suction valve is broken or clogged. If necessary, replace the compressor.
If the expansion valve opens too much, the valve could be poor. Replace the valve. Contact with the thermal tube could be poor. Repair the thermal tube.
The outside temperature is abnormally low.
If the refrigerant is low, there could be an insufficient refrigerant charge. Recharge the refrigerant to the correct level. If the refrigerant is low, there could be a gas leak. Perform the leak and the