Accumulator HVAC: Service and Repair

The suction accumulator/drier should be replaced when:
1. Unit is restricted, plugged or perforated.
2. System has been left open for 1-2 months.
3. There is evidence of moisture in system such as internal corrosion of metal lines or dark, thick refrigerant oil.
4. There are more than 5 ounces of refrigerant oil in suction accumulator/drier indicating bleed hole is clogged.

Do not replace suction accumulator/drier each time the following condition exists:
1. There is a loss of refrigerant charge.
2. A component such as a condenser, evaporator or compressor is replaced.
3. A dent is found in outer shell of suction accumulator/drier.

Fig. 6 Accumulator/dryer:

1. Discharge refrigerant from system.
2. On vehicles equipped with 4-140 engine, remove speed control servo, if equipped.
3. On all vehicles, disconnect suction hose at compressor and cap both hose and compressor.
4. Disconnect accumulator inlet tube from evaporator core outlet, Fig. 6.
5. Disconnect wire harness connector from pressure switch on top of accumulator.
6. Remove accumulator to accumulator bracket attaching screw and remove accumulator.
7. Reverse procedure to install. Use new O-ring lubricated with refrigerant oil.
8. Leak test, evacuate and charge system. Check system for proper operation.