Accumulator is used in automotive air conditioning system to store surplus liquid refrigerant. In other words accumulator is used in systems that uses thermal expansion valve. There are two functions of an AC drier
1.Drier has to separate gas and liquid.
2.Drier has to remove moisture and filter the dirt.
Air conditioning working fluids is subjected to compression and expansion, this undergoes condensation and evaporation leading to accumulation of water and contamination. At these conditions driers are used to flush out the water and contaminants getting into the system. Another threat to your AC system is dirt. It is inevitable collected when the we drive the vehicle, these dirt pose a major threat to your car AC system.
There are several variants of driers or accumulators and different dying materials are used. Some of the dying materials are not compatible with the drier and these informations can be found only with the sticker pasted on the AC drier. AC Accumulator/driers are disposable items like fuel. These driers has to be replaced with respect to any changes or replacement to avoid moisture in the system. This avoid damage in the compressor.