Mitsubishi Montero 1987 Service Manual download pdf (Page 274)

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AIR-CONDITIONING-Service Adjustment Procedures

(4) Purge the air from the charging line by loosening the charging

hose at the gauge set manifold and turning one of the refrig-

erant valves counterclockwise to release refrigerant. When

the refrigerant gas starts escaping from the loose connection,

re-tighten the hoses.

Caution

Never heat small refrigerant cans over 52°C (125°F) as they

mad explode.

(5) qully open all refrigerant manifold valves being used and place

the cans of refrigerant into a pan containing 52°C (125°F) water

will warm the charging can and aid in the transfer of the charge

into the system. Place the water pan and refrigerant cans on

a scale and note the weight.

(6) Jump the low pressure switch terminals located on the re-

ceiver drier so the clutch will remain engaged.

(7) Start the engine and move the controls to air conditioner

switch on and low blower position.

The low pressure switch will prevent the clutch from engaging

until refrigerant is added to the system. If the clutch does

engage, replace the switch before proceeding any further.

(8) Charge through the suction side of the system by slowly open-

ing the suction manifold valve. Adjust the valve as necessary

so charging pressure does not exceed 345 kPa (50 psi).

Maintain the temperature of the water in the pan by adding

warm water as necessary. Note the weight of water

added, to ensure accuracy when determining amount of

refrigerant added to system.

(9) Adjust the engine speed to a fast idle of approximately 1500

rpm.

(IO) When specified refried refrigerant charge 730 (1.6 Ibs.) has

entered the system, close the gauge set manifold valves,

refrigerant manifold valves, and reconnect wiring. Each

can contains 397 g (14 oz.) of R-12. Use 2 l/2 cans.

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Mitsubishi Montero 1987 Service Manual Page 274