REFILLING OF OIL IN THE A/C SYSTEM
Too little oil will provide inadequate compressor lubrication and cause a compressor failure. Too much oil will increase discharge air temperature.
When a compressor is installed at the factory, it contains 140 cm 3 (4.7 floz) of refrigerant oil. While the A/C system is in operation, the oil is carried through the entire system by the refrigerant. Some of this oil will be trapped and retained in various parts of the system.
When the following system components are changed, it is necessary to add oil to the system to replace the oil being removed with the component.
Compressor oil: SUN PAG 56
Quantity
- Evaporator: 60 cm 3 (2.0 floz)
- Condenser: 15 cm 3 (0.5 floz)
- Suction hose: 10 cm 3 (0.3 floz)
Scheme 422
Scheme 423
- The vehicles to be tested should be in a place that is not in direct sunlight.
- Close the high and low-pressure valve of the gauge manifold.
- Connect the charging hose (blue) to the low-pressure valve and connect the charging hose (red) to the high-pressure valve of the gauge manifold.
- Install the quick joint (for low-pressure) to the charging hose (blue), and connect the quick joint (for high-pressure) to the charging hose (red). CAUTION: To connect the quick joint, press section A firmly against the service valve until a click is heard. When connecting, run your hand along the hose while pressing to ensure that there are no bends in the hose. NOTE: The high-pressure service valve is on the liquid pipe A and the low-pressure service valve is on the suction hose.
- Connect the quick joint (for low-pressure) to the low-pressure service valve and connect the quick joint (for high-pressure) to the high-pressure service valve.
- Start the engine.
- Set the A/C controls as follows: A/C switch: A/C - ON position Mode selection: FACE position Temperature control: MAXIMUM COOLING position Air selection: RECIRCULATION position Blower switch: "4" (HI) position
- Adjust engine speed to 1,500 r/min with A/C clutch engaged.
- Engine should be warmed up with doors and windows closed.
- Insert a thermometer in the center air outlet and operate the engine for 20 minutes. NOTE: If the clutch cycles, take the reading before the clutch disengages.
- Note the discharge air temperature.
