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Q: How to replace the A/C Accumulator on GMC Yukon XL 2500?
A: To replace the accumulator, you should recover the refrigerant first. You need to remove the evaporator tube nut and the steam evaporators. Then remove the nut from the evaporator tube and disconnect the electrical connector from the a/c low pressure switch. Unscrew the compressor hose nut off the accumulator and then compressor hose. Then remove the nut (from the evaporator fitting) and the accumulative bracket nut (from retaining stud) before getting rid of the accumulator. Remove o-ring seals, bolt and retaining bracket from the accumulator. For the installation, you should install new o-ring seals, and if you replace the accumulator, add refrigerant oil to the condenser. Mount the retaining bracket onto the accumulator, fasten it with the retaining bracket bolt and tighten it with the torque of 10 n.m (89 lb in). Wrench the accumulator and accelerator bracket nut with a torque of 9 n.m (80 lb in). Next, install the nut to the evaporator fitting, tighten it 16 nm (12 lb ft), the compressor hose to the accumulator and again the compressor hose nut, tighten that to 16 n.m (12 lb ft). Reconnect the electric connector to the a/c low pressure switch and fasten the nut of the evaporator tube to 25 n.m (18 lb ft). Lastly, install the evaporator tube to the evaporator and the evaporator tube nut and tighten to 16n.m (12 lb ft). Evacuate and recharge the system, and conduct a leak test on the fittings with the halogen leak detector (J 39400-A).