Car encyclopedia

Air Conditioning Accumulator

The AC accumulator is a holding vessel that receives refrigerant after it leaves the evaporator. Its primary fiction is to covert any remaining liquid refrigerant into its gaseous state before it enters the compressor. It also contains a desiccant, a moisture absorbing element to to help "dry out" the refrigerant.

Symptoms of Wear or Failure

  • Weak cool air from system (or no cold air at all)

Related Repair Advice

  • The accumulator contains a desiccant, which absorbs any moisture in the refrigerant. If the system is open to the atmosphere more than a short period of time, the desiccant can become "full" of moisture, which can lead to corrosion. This can cause the expansion valve or orifice tube to freeze, which can block refrigerant flow in the system.
  • We recommend replacing the AC accumulator when the AC compressor is replaced. The accumulator acts as a moisture and debris filter for the AC system and a new part will keep the repaired system clean.

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