The Accumulator/Drier, also referred to as a Receiver Drier, has a very specific function in your BMW A/C system. It filters out all the moisture and debris which can cause your Compressor to fail. The A/C Accumulator/Drier contains thermal expansion and liquid refrigerant. An Accumulator/Drier is used to accumulate the liquid and temporarily the gas. The function of the A/C Accumulator/Drier is to separate the liquid and the gas. The secondary purpose of the Accumulator is to absorb the moisture that is found in the air and to remove dust. There is a sight glass in the Accumulator/Drier which must not show any bubbles. If any bubbles are visible, the Accumulator Drier is damaged and you need to get it replaced.
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