Receiver-drier (A/C Drier)
The receiver-drier is a small canister in the A/C high-pressure line that stores refrigerant, filters debris and absorbs moisture.
What is Receiver-drier (A/C Drier)?
It is used in systems with an expansion valve; orifice tube systems use an accumulator on the low-pressure side instead. In many modern cars the drier is integrated into the side tank of the condenser as a replaceable cartridge. The desiccant inside can only absorb a limited amount of moisture.
How it works
Liquid refrigerant flows through a filter and a bag of desiccant before continuing to the expansion valve.
Why it matters for your car
Many compressor and repair manufacturers recommend replacing the drier whenever the system has been opened for a longer time or after a compressor failure. Moisture in the system can form acids and ice at the expansion valve, which reduces cooling.
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