14-25. AIR-CONDITIONING SERVICE VALVE REPLACEMENT (R-12)
This task covers:
Air-conditioning system discharged
Air horn to air cleaner hose removed
General mechanic's tool kit:
General Safety Instructions
Air conditioner system must be discharged,
prior to replacing components.
Air conditioner system must be discharged, prior to replacing
components in vapor system. Failure to do this may result in
injury to personnel or damage to equipment.
Suction (low pressure) and discharge (high pressure) service
valves are replaced basically the same. This procedure covers the
suction service valve.
The following procedure applies to vehicles with R-12 refrigerant
only. Refer to para. 14-27.9 for vehicles with R-134a refrigerant.
Disconnect suction line (1) from service valve (2).
Remove suction service valve (2) and two O-rings (3) from compressor (4). Discard O-rings (3).
Lubricate two O-rings (3) with lubricating oil and install on suction service valve (2).
Install suction service valve (2) on compressor (4).
Connect suction line (1) to suction service valve (2).
FOLLOW-ON TASKS: Evacuate and charge air-conditioning system (para. 14-17).
Install air horn to air cleaner hose (TM 9-2320-280-20).