Mitsubishi Montero 1987 Service Manual download pdf (Page 273)

AIR-CONDITION1 G-Service Adjustment Procedures

24-37

water

2OUO326

(5) Start the vacuum pump and operate until the evaporator suc-

tion gauge registers at least-101 kPa (29.9 in.of vacuum).

If at least-101 kPa (29.9 in. of vacuum) cannot be obtained,

either the system has a leak or the vacuum pump is defective.

Check the vacuum pump. If the pump proves to be functioning

properly, the system has a leak. Charge the system with one

pound of refrigerant. Locate and repair all leaks. Discharge the

refrigerant and evacuate the system.

(6) Continue to operate the pump for at least five minutes.

(7) Close manifold valves. Turn off the vacuum pump and observe

evaporator suction gauge for two minutes. The vacuum level

should remain constant.

If the vacuum level falls off, the system has a leak. Charge the

system with one pound of refrigerant. Locate and repair all

leaks. Discharge the system and repeat evacuation procedure.

CHARGING THE SYSTEM

The refrigerant system must have been evacuated using the pre-

vious procedure before charging. Charge using only R-l 2 refriger-

ant R-l 2 is available in bulk tanks or small cans. Follow the safety

precautions for handling R-12 as listed in the beginning of this

group.

Charging with Small Cans

When using disposable cans of this type, follow carefully the can

manufactures instructions.

Caution

Never use these cans to charge into the high pressure side of

the system (compressor discharge port) or into a system that

is at high temperature, because the high system pressures

could be transferred into the charging can causing it to ex-

plode.

Keep the refrigerant manifold valves capped when not in use.

Keep a supply of extra refrigerant-can-to-refrigerant-manifold gas-

kets on hand so that gaskets can be replaced periodically. This will

insure a good seal without excessive tightening of the can or the

manifold nuts.

(1) Attach center hose from manifold gauge set to refrigerant

dispensing manifold. Turn refrigerant manifold valves com-

pletely counterclockwise so they are fully open. Remove pro-

tective caps from refrigerant manifold.

(2) Screw refrigerant cans into manifold. Be sure manifold-to-can

gasket is in place and in good condition. Tighten can and man-

ifold nuts to 8 to 11 Nm (6 to 8 ft.lbs.)

(3) Turn refrigerant manifold valves completely clockwise to

puncture the cans and close the manifold valves.

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Mitsubishi Montero 1987 Service Manual Page 273

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