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The accumulator has a similar function to the receiver drier, but works on the gaseous side of the A/C loop. The accumulator protects the system components. It is located on the low-pressure side of the circuit between the evaporator outlet and the compressor suction port. The accumulator has different roles:

  • To provide compressor protection, preventing compressor failure due to liquid slugging
  • To retain moisture and contaminants from the system (during the accumulator's lifetime)
  • To ensure oil return and ensure that only refrigerant is returning to the compressor.


Valeo Info: The accumulator is a filter drier that must be replaced approximately every 3 years, or whenever the circuit is opened.

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