Accumulator HVAC: Service and Repair

1. Disconnect battery ground cable, then discharge system refrigerant.
2. Disconnect low pressure switch or pressure cycling switch (if equipped).
3. Remove accumulator guard (if equipped).
4. Disconnect accumulator inlet and outlet lines. Until accumulator is about to be installed, inlet and outlet fittings must remain plugged to prevent moisture contamination from atmosphere. While new units are supplied with caps for this purpose, plastic sheet and elastic bands may be used on units removed from vehicles.
5. Remove accumulator bracket retaining screws, then remove accumulator from vehicle.
6. Reverse procedure to install. If installing new unit, measure level of refrigerant oil in old unit. Add this amount of clean 525 viscosity refrigerant oil, plus 2 fluid ounces, to new unit. Install new O-rings coated with clean refrigerant oil when installing inlet and outlet lines.