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.

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PRESSURE TEST

(1)

Inspect AC test set recovery/recycling manifold

high-side gage reading.

(a) If gage reading is not lower than the range for

the ambient temperature indicated in the chart

shown on page 0015-11 for normal high-side

pressure, go to Step 8 of this fault.

(b) If gage reading is lower than the range for the

ambient temperature indicated in the chart

shown on page 0015-11 for normal high-side

pressure, go to Step 7 of this fault.

VISUAL INSPECTION

(1)

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

(2)

Inspect AC hoses from system low-side AC service

valve to system high-side AC service valve for frost

and cool spots.

(a) If hoses are not free from frost and cool spots:

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

2. Replace restricted AC hose (WP 0040).

3. Replace AC condenser dryer (WP 0025).

4. Evacuate and recharge system

(WP 0050).

5. Verify repair, go to Step 22 of this fault.

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.

(b) If hoses are free from frost and cool spots:

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

2. Purge and flush system (WP 0050).

3. Replace AC compressor (WP 0023).

HEMAC179

4. Replace AC condenser dryer (WP 0025).

5. Evacuate and recharge system with new

R-134a refrigerant (WP 0050).

6. Verify repair, go to Step 22 of this fault.

0015-13