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 TM 55-1905-219-14-8
4-5. GENERAL (Continued).
Table 4-7. Air Conditioner Erratic Operation
Troubleshooting (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 7.
Low pressure control switch set too high or defective.
Reset low pressure control or repair or replace, if defective.
Step 8.
Internal leak in heat interchanger.
Test for leaks and replace, if necessary.
4. Compressor runs continuously.
Step 1.
Shortage of refrigerant.
Test for refrigerant undercharge. Add refrigerant.
Test and repair any leaks.
Step 2.
Compressor discharge valve leaks badly.
Test valve. If leaking, pump down, remove cylinder
head, and repair or replace valve.
Step 3.
Solenoid valve at evaporator does not close tightly.
Pump down and check solenoid. If pin or seat are worn, replace parts or valve.
Step 4.
Leaking piston rings or worn cylinder sleeve.
Replace worn rings or cylinder sleeve.
4-37
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