AC DOES NOT COOL OR COOLS INADEQUATELY - Continued

DRAFT

TB 9-2320-279-13-1

AC DOES NOT COOL OR COOLS INADEQUATELY - Continued

WARNING

Moving engine components can cause severe injury. Keep away from fan, belts, and pulleys while

engine is running.

Wear protective goggles and nonleather gloves when servicing air conditioner system. Failure to

comply may result in injury to personnel.

VISUAL INSPECTION

(1)

Connect AC test set recovery/recycling manifold

gages to AC service valves (WP 0050). Ensure

test set valves are closed.

(2)

Remove AC condenser dryer sight glass access

hole cover.

(3)

Start engine (TM 9-2320-279-10).

(4)

Operate AC system for 5 to 10 minutes at high

blower speed (WP 0004).

(5)

Inspect AC condenser dryer sight glass.

(a) If AC condenser dryer sight glass indicates

desiccant breakdown or oil in system:

1. Shut off engine (TM 9-2320-279-10).

2. Perform leak test (WP 0049).

3. Recover R-134a refrigerant (WP 0050).

4. Repair leaks found.

CAUTION: Do not flush AC condenser dryer, AC

compressor, or AC expansion valve. After flushing

system, add required refrigerant oil or damage to

equipment may result.

5. Flush system (WP 0050).

6. Replace AC condenser dryer (WP 0025).

7. Evacuate and charge system with new

R-134a refrigerant (WP 0050).

8. Start engine.

9. Operate AC system for 5 to 10 minutes at

high blower speed (WP 0004).

10. Go to Step 4 of this fault.

(b) If AC condenser dryer sight glass does not

indicate desiccant breakdown or oil in system,

go to Step 4 of this fault.

HEMAC176