The AC receiver drier is a device that only appears in air conditioning systems that employ expansion valves. The cylindrical component is found between the condenser outlet and the expansion valve inlet.
To understand what an AC receiver drier does, one must have a basic understanding how their car’s air conditioner works. Yes, it transforms hot air to cold. But there’s more to it. It does so by circulating a refrigerant that changes phase from liquid to gas and back again when forced through the system. The cold liquid refrigerant is squeezed through an evaporator, removing heat from air pulled in from the car’s cabin. Once cooled and dried, a blower pushes the air back out into the car. The warmed and vaporized refrigerant circulates through a compressor, where the vapor is cooled and transformed back into a liquid. And the process is repeated, over and over again, until you shut the AC off.
Th receiver drier serves as a filter to remove any moisture and contaminants that get into the AC system during this process. ACR Drier has three parts:
The receiver drier must be changed each time your mechanic opens the system for service. Most compressor warranties require it. At the very least, it should be replaced every three years.
Moisture kills an air conditioning system. Once inside, it combines with refrigerant, forming hydrochloric acid, which is extremely corrosive to metal components. So replacing the receiver drier is essential when servicing the air conditioner. If you replace any component of the system you must also replace the receiver drier. If you do not, there could be serious damage to the other parts of the system, which could be very costly in the long run.
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