TM 9-2320-302-20
0017 00-8
AIR CONDITIONING SYSTEM TROUBLESHOOTING AND TESTING - CONTINUED
0017 00
AIR CONDITIONING SYSTEM TROUBLESHOOTING - CONTINUED
Table 4. Problem - Quick or Delayed Cycling of Compressor.
Table 5. Problem - Temperature in Cab Too Low or No Heat.
Table 6. Problem - Condensed Water Is Leaking from Air Conditioner.
POSSIBLE CAUSE
REMEDY
Thermostatic switch operates, but is out of
adjustment.
Replace thermostatic switch. Do not attempt to adjust it.
Loss of refrigerant is causing a delayed
cycling of compressor.
Perform air conditioner leak test (WP 0225 00).
POSSIBLE CAUSE
REMEDY
Water regulating valve is not open.
Slide temperature lever slide control toward “warm”.
Water regulating valve is not opening
fully.
Adjust water regulating valve cable.
Water regulating valve is not working.
Replace water regulating valve.
Heater hose is pinched or twisted.
Repair or replace heater hose.
Coolant is leaking from system.
Check for leakage at heater core and at all hose connections from heater core to
engine. Check radiator coolant level and add coolant if necessary (TM 9-2320-302-
10). Check and repair any leaks at the radiator.
Dust or dirt is clogging heater core fins.
Remove and clean heater core.
POSSIBLE CAUSE
REMEDY
Drain tubes are plugged.
Clean drain holes and drain tubes.
