TM 9-2320-363-20-1
PROBLEM - HIGH COMPRESSOR DISCHARGE PRESSURE
Possible Cause
Remedy
Airflow through the condenser is
Remove the debris from the condenser.
restricted.
Air is present in the system.
Perform a leak test.
Heavy frosting on the suction line
Defrost the evaporator coil before resuming operation of the air
suggests that the evaporator coil is
conditioner.
flooded.
PROBLEM EVAPORATOR OUTLET AIR TEMPERATURE INCREASES AS COMPRESSOR DISCHARGE PRESSURE
DROPS
Possible Cause
Remedy
There are leaks in the system.
Leak test the system.
Too much oil is in the system. An
Check and remove excess refrigerant oil. For instructions, refer to the
indication of this is clutch or belt
refrigerant compressor section elsewhere in this group.
slippage at governed engine speed.
PROBLEM - COMPRESSOR OPERATES TOO OFTEN OR CONTINUOUSLY
Possible Cause
Remedy
There is too little refrigerant in the
Perform a leak test.
system.
Ice has formed on the evaporator
Defrost the evaporator coil before resuming operation of the air
coil.
conditioner. Check the operation of the thermostatic switch, and replace
as necessary.
Dirt and debris are clogging the
Remove all dirt and debris from the condenser fins.
condenser fins.
The thermostatic switch isn't
Replace the thermostatic switch.
working.
PROBLEM - QUICK OR DELAYED CYCLING OF COMPRESSOR
Possible Cause
Remedy
The thermostatic switch operates,
Replace the thermostatic switch. Do not attempt to adjust it.
but is out of adjustment.
Loss of refrigerant is causing a
Leak test.
delayed cycling of the compressor.
3-92.8 Change 3
