Accumulator HVAC: Description and Operation

Accumulator - Typical:

An accumulator is used on 2.0L LHD models. The accumulator is mounted in the engine compartment between the evaporator outlet and the compressor suction port. An integral mounting bracket is used to secure the accumulator to the right side rail with a bolt. A threaded fitting on the top of the accumulator canister provides the port through which the A/C low pressure switch monitors the refrigerant system pressures.

The accumulator cannot be repaired and, if faulty or damaged, it must be replaced. The suction and liquid lines, the rubber O-rings and the A/C low pressure switch are available for service replacement.

Refrigerant enters the accumulator canister as a low pressure vapor through the inlet tube. Any liquid, oil-laden refrigerant falls to the bottom of the canister, which acts as a separator. A desiccant bag located inside the accumulator canister absorbs any moisture which may have entered and become trapped within the refrigerant system.