TB 9-2320-302-13&P-3
A/C TROUBLESHOOTING PROCEDURES - CONTINUED
0013 00
MALFUNCTION
CAUSE OR TEST
CORRECTIVE ACTION
A/C SYSTEM PRESSURE DIAGNOSIS
High Side and Low Side Pressure Excessive oil in system.
Restore proper oil level in
1.
compressor (WP 0015 00).
Normal and Evaporator
Assembly Not Producing Cold
Air.
Moisture in system. Moisture freezes,
Replace receiver/dryer (WP 0019
2.
High Side Pressure Normal to
High - Low Side Pressure Normal temporarily stopping cycle; normal system
operation returns when ice melts.
to High.
1. Leak test A/C system (WP 0016 00).
Repair or replace any leaks found in
3.
High Side Pressure Low - Low
system. If no leaks are found, proceed
Side Pressure Low.
to step 2.
2. Incorrect charge.
Recharge system (WP 0015 00).
Replace receiver/dryer (WP 0019
Refrigerant flow obstructed in receiver/
4.
High Side Pressure Low - Low
dryer.
Side Pressure Zero to Negative -
Frost on Tubes From
Receiver/Dryer to Evaporator
Assembly.
1. Internal leak in compressor or
Replace compressor (WP 0016 00).
5.
High Side Pressure Low - Low
compressor mechanically broken.
Pressure Side High.
2. Compressor drive belt slipping.
Adjust drive belt tension (WP 0016
1. Inspect system for kinked or damaged
Replace damaged hose (WP 0020
6.
High Side Pressure High - Low
00). If no damage is found, proceed
hoses.
Pressure Side Low.
to step 2.
2. Restriction in condenser.
Replace condenser (WP 0018 00).
1. Inspect system for kinked or damaged
Replace damaged hoses (WP 0020
7.
High Side Pressure High - Low
00). If no damaged hoses are found,
hoses.
Pressure Side High - Low Side
proceed to step 2.
Lines Hot to Touch.
2. Verify system for air contamination.
Leak test system (WP 0015 00).
Repair as necessary.
1. Condenser fins obstructed.
Clean condenser fins.
8.
High Side Pressure High - Low
Pressure Side High.
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
END OF WORK PACKAGE
0013 00-17/(0013 00-18 Blank)