PROBLEM - COMPRESSOR OPERATES TOO OFTEN OR CONTINUOUSLY

TM 9-2320-303-24-1

AIR CONDITIONING SYSTEM TROUBLESHOOTING AND TESTING - CONTINUED

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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 refrigerant

indication of this is clutch or belt slippage compressor section elsewhere in this group.

at governed engine speed.

PROBLEM - COMPRESSOR OPERATES TOO OFTEN OR CONTINUOUSLY

POSSIBLE CAUSE

REMEDY

There is too little refrigerant in the system. Perform a leak test.

Ice has formed on the evaporator coil.

Defrost the evaporator coil before resuming operation of the air conditioner.

Check the operation of the thermostatic switch, and replace as necessary.

Dirt and debris are clogging the condenser Remove all dirt and debris from the condenser fins.

fins.

The thermostatic switch isn't working.

Replace the thermostatic switch.

PROBLEM - QUICK OR DELAYED CYCLING OF COMPRESSOR

POSSIBLE CAUSE

REMEDY

The thermostatic switch operates, but is Replace the thermostatic switch. Do not attempt to adjust it.

out of adjustment.

Loss of refrigerant is causing a delayed Leak test.

cycling of the compressor.

PROBLEM - TEMPERATURE IN CAB TOO LOW OR NO HEAT

POSSIBLE CAUSE

REMEDY

The water regulating valve is not opened. Slide the temperature lever slide control toward "warm".

The water regulating valve is not opening Adjust the water regulating valve cable.

all the way.

The water regulating valve isn't working. Replace the water regulating valve.

A heater hose is pinched or twisted.

Repair or replace the heater hose.

Coolant is leaking from the system.

Check for leakage at the heater core, and at all hose connections from the heater

core to the engine. Check the radiator coolant level, and add coolant, if necessary.

Check and repair any leaks at the radiator.

Dust or dirt is clogging the heater core Remove and clean the heater core.

fins.

PROBLEM - CONDENSED WATER IS LEAKING FROM AIR CONDITIONER

POSSIBLE CAUSE

REMEDY

The drain tubes are plugged.

Clean the drain holes and drain tubes.

END OF WORK PACKAGE

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