Do I Really Need to Change my Receiver-Drier/Accumulator?

The receiver-drier and evaporator. It is connected directly to the evaporator outlet and stores excess liquid refrigerant. Introduction of liquid refrigerant into a compressor can do serious damage. The chief role of the accumulator is to isolate the compressor from any damaging liquid refrigerant. Accumulators, like receiver-driers, also remove debris and moisture from a system.</p>">accumulator contains a bag of dessicant which is used to trap system damaging moisture. Moisture inside your a/c system can cause ice formation and corrosion. Acid that forms when refrigerant mixes with moisture can weaken aluminum components such as the Condenser and Evaporator.

Because desiccant materials break down with age and the bag that contains it can rupture, you should replace the Receiver Drier or Accumulator if it's over five years old - or - any time the system is opened for major repair.