The receiver drier is a storage tank for the liquid refrigerant from the condenser. It also contains a bag of desiccant.
The purpose of the desiccant is to absorb any moisture that might enter the system during assembly or service. The receiver drier is often neglected when the air conditioning system is serviced or repaired. Failure to replace it can lead to poor system performance or replacement part failure.
When should I change my AC filter drier?
It is recommended that the receiver drier and /or its desiccant be changed whenever a component is replaced, the system has lost the refrigerant charge, or the system has been open to the atmosphere for any length of time.
AC receiver drier refrigerant flow restriction.
If the receiver-drier outlet is colder than the inlet, this unit is restricted and should be changed to restore efficient and proper system operation.
The air-conditioning system cools satisfactorily during the early morning or late evening, but does not cool during the hot part of the day.
The problem is that the A/C system seems to work fine in the early morning and evenings, but does not during the heat of the day. During a performance test, the low-side gauge reads normal and then drops dramatically.
Ice could be forming on the expansion valve
The receiver drier could be saturated with moisture
Moisture in the system can be released from the desiccant in the receiver-drier by an increase in temperature on the high side. When the ambient temperature is lower the desiccant may be able to hold the moisture out of the refrigerant. Internal freezing of the expansion valve could produce external icing on the valve.
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