SEAL 7I8858 - Caterpillar

System Condition 3
Low-pressure gauge reading is below normal. For normal operating pressures, refer to Table 1.
High-pressure gauge reading is below normal. For normal operating pressures, refer to Table 1. Note: Ambient temperature is above 21° C (70° F).
The cylinder section of the refrigerant compressor gets excessively hot. Probable Cause
Worn piston rings causing blow-by of gases around the rings will result in inefficient compressor operation. Replace the refrigerant compressor.
Remove the refrigerant charge. Refer to Testing and Adjusting, "Refrigerant Recovery".
Evacuate the system. Refer to Testing and Adjusting, "Refrigerant System - Evacuate".
Charge the system. Refer to Testing and Adjusting, "Refrigerant System - Charge".
For the oil level in the system, refer to Testing and Adjusting, "Refrigerant Compressor Oil - Check". System Condition 4
Low-pressure gauge reading is below normal. For normal operating pressures, refer to Table 1.
High-pressure gauge reading is normal. For normal operating pressures, refer to Table 1. Note: Ambient temperature is above 21° C (70° F).
Bubbles continuously appear in the sight glass.
The cylinder section of the compressor does not get hot. Probable Cause
The expansion valve could be held in the OPEN position.
Replace the expansion valve. Refer to Service Manual, SENR5664, "Expansion Valve - (Air Conditioner) Remove and Install" section in Disassembly and Assembly. System Condition 5
Low-pressure gauge reading is normal. For normal operating pressures, refer to Table 1.
High-pressure gauge reading is below normal. For normal operating pressures, refer to Table 1. Note: Ambient temperature is above 21° C (70° F).
Bubbles continuously appear in the sight glass. Probable Cause
The condenser is dirty or clogged.
Clean the condenser. System Condition 6
Low-pressure gauge reading is normal. For normal operating pressures, refer to Table 1.
High-pressure gauge reading is below normal. For normal operating pressures, refer to Table 1. Note: Ambient temperature is above 21° C (70° F).
High pressure lowers gradually. Probable Cause
The high-pressure circuit before the receiver-dryer is clogged.
Remove the clog or replace the part. Blower Motor Does Not Rotate
Note: If any abnormal condition is evident such as, blower motor does not turn due to interference of fan and case, or the blower motor is seized, etc., remove the cause first, such as to remove the interference, and then connect power to the power terminal of the blower motor in order to see if the motor rotates first.Note: All connectors disconnected for testing should be reconnected after the making repairs.
Use the fan switch to set the air flow to the maximum High position.
Remove connector (G) from the blower motor connector. Check to see if voltage is applied between the "PK" wire and the "BK/WH" wire on connector (G). If there is no voltage, see Step 3. If there is voltage, then the blower motor has failed. Replace the blower motor.
Check the battery voltage applied between the "PK" wire at (+) side of the blower motor and shovel body. If there is no voltage, see Step 3. If there is voltage, see Step 7.
Check the blower motor relay. Directly connect the "WH/RD" wire and the "PK" wire on the blower motor relay to see if the motor