AC DOES NOT COOL OR COOLS INADEQUATELY - continued

DRAFT

TB 9-2320-364-13&P-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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VISUAL INSPECTION

(1)

Shut off engine (TM 9-2320-364-10).

(2)

Inspect AC hose from system low-side AC service

valve to AC compressor for frost and cool spots.

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

1. Recover R-134a refrigerant (WP 0053).

2. Replace restricted AC hose (WP 0039).

3. Replace AC condenser dryer (WP 0024).

4. Evacuate and charge system (WP 0053).

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

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

to Step 15 of this fault.

PRESSURE TEST

NOTE: System high-side pressure should vary as

engine RPM varies.

(1)

While assistant varies engine RPM with

accelerator pedal (TM 9-2320-364-10), monitor AC

test set recovery/recycling manifold high-side

pressure gage. Note whether system high-side

pressure varies with engine RPM.

(2)

Shut off engine (TM 9-2320-364-10).

(3)

Recover R-134a refrigerant (WP 0053).

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.

(4)

If system high-side pressure did not vary with

engine RPM in Step (1) above:

1. Purge and flush system (WP 0053).

2. Replace AC compressor (WP 0022).

3. Replace AC condenser dryer (WP 0024).

4. Evacuate and charge system with new

R-134a refrigerant (WP 0053).

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

(5)

If system high-side pressure varied with engine

RPM in Step (1) above:

1. Replace AC expansion valve (WP 0030).

2. Replace AC condenser dryer (WP 0024).

3. Evacuate and charge system with new

PLSAC212

R-134a refrigerant (WP 0053).

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

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