TB-9-2320-302-13-P-3
CREW PROTECTION KIT; AIR CONDITIONING KIT PART 3 OF 3
TECHNICAL BULLETIN; OPERATOR’S, UNIT, AND DIRECT SUPPORT, MAINTENANCE MANUAL, INSTALLATION INSTRUCTIONS, AND REPAIR PARTS AND SPECIAL TOOLS LIST
MARCH 2008
TB-9-2320-302-13-P-3 - Page 81 of 240
TB 9-2320-302-13&P-3
A/C TROUBLESHOOTING PROCEDURES - CONTINUED
0013 00
0013 00-17/(0013 00-18 Blank)
END OF WORK PACKAGE
MALFUNCTION
CAUSE OR TEST
CORRECTIVE ACTION
A/C SYSTEM PRESSURE DIAGNOSIS
1.
High Side and Low Side Pressure
Normal and Evaporator
Assembly Not Producing Cold
Air.
Excessive oil in system.
Restore proper oil level in
compressor (WP 0015 00).
2.
High Side Pressure Normal to
High - Low Side Pressure Normal
to High.
Moisture in system. Moisture freezes,
temporarily stopping cycle; normal system
operation returns when ice melts.
Replace receiver/dryer (WP 0019
00).
3.
High Side Pressure Low - Low
Side Pressure Low.
1. Leak test A/C system (WP 0016 00).
Repair or replace any leaks found in
system. If no leaks are found, proceed
to step 2.
2. Incorrect charge.
Recharge system (WP 0015 00).
4.
High Side Pressure Low - Low
Side Pressure Zero to Negative -
Frost on Tubes From
Receiver/Dryer to Evaporator
Assembly.
Refrigerant flow obstructed in receiver/
dryer.
Replace receiver/dryer (WP 0019
00).
5.
High Side Pressure Low - Low
Pressure Side High.
1. Internal leak in compressor or
compressor mechanically broken.
Replace compressor (WP 0016 00).
2. Compressor drive belt slipping.
Adjust drive belt tension (WP 0016
00).
6.
High Side Pressure High - Low
Pressure Side Low.
1. Inspect system for kinked or damaged
hoses.
Replace damaged hose (WP 0020
00). If no damage is found, proceed
to step 2.
2. Restriction in condenser.
Replace condenser (WP 0018 00).
7.
High Side Pressure High - Low
Pressure Side High - Low Side
Lines Hot to Touch.
1. Inspect system for kinked or damaged
hoses.
Replace damaged hoses (WP 0020
00). If no damaged hoses are found,
proceed to step 2.
2. Verify system for air contamination.
Leak test system (WP 0015 00).
Repair as necessary.
8.
High Side Pressure High - Low
Pressure Side High.
1. Condenser fins obstructed.
Clean condenser fins.
2. Engine cooling fan not working properly. Troubleshoot engine fan. Proceed to
correct symptom (WP 0012 00).
3. Refrigerant system overcharged.
Recover refrigerant and recharge
system (WP 0015 00).
4. Expansion valve not operating correctly. Replace expansion valve (WP 0017
00).
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