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TM 9-4120-389-14
SECTION III
TROUBLESHOOTING TABLE 5-1. (continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3.
SUCTION PRESSURE TOO HIGH
Step 1.
Check for dirty air conditioner filter.
Clean filter per paragraph 4-19.
Step 2.
Check to see if evaporator inlet and outlet louvers are closed.
Adjust louvers.
Step 3.
Check for dirty evaporator coil.
Clean evaporator coil per paragraph 4-67.
Step 4.
Check sight glass for low refrigerant charge.
Charge the refrigerant system per paragraph 5-8.
Step 5.
Check to see if solenoid valve is stuck closed.
Follow procedures of paragraph 5-14 to replace valve.
Step 6.
Check operation of evaporator fan motor per paragraph 4-34.
Replace motor per paragraph 4-34.
Step 7.
Check to see if evaporator impeller fans are loose on shafts.
Tighten evaporator impeller fans on shafts per
paragraph 4-32.
Step 8.
Test the liquid quench expansion valve per paragraph 5-17.
Replace faulty valve per paragraph 5-17.
Step 9.
Check distributor and evaporator coil tubings for kinks and
restrictions.
Follow procedures of paragraph 5-28 to repair and
replace tubing.
Step 10.
Check sight glass for evidence of bubbles and refrigeration
level that indicate severe refrigerant blockage.
Follow procedures of paragraph 5-28 to repair and
replace tubing.
Follow procedures of paragraph 5-10 to replace
clogged dehydration.
Step 11.
Check the sight glass for moisture in the system (Yellow indications).
Replace filter per paragraph 5-10.
5-21
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