What is an AC receiver dryer?
The receiver dryer looks like a small black jar with an air conditioning line going out of each end. It’s located on the high pressure side of your car’s AC in between the AC condenser and evaporator.
You probably already know that coolant or refrigerant moves throughout the system, switching from gas to liquid and back again. As the coolant circulates, it passes through the receiver dryer, where the dryer filters out moisture and contaminants.
The receiver dryer is made up of three parts, the container or housing, the inlet/outlet, and the desiccant sack. The sack is full of desiccant pellets that absorb moisture. The inlet/outlet allows the coolant to flow throughout the system, and the container temporarily holds oil and coolant.
Tip: You’ll sometimes see the receiver dryer spelled “receiver drier.” This is the same part.
How do you know if a receiver dryer is bad?
It’s always a little tricky to pinpoint problems with the AC, but here are signs that the receiver dryer is worn or damaged:
Strange sounds when the AC runs: Your AC should be silent when you’re using it. Any unusual or different sounds are a sign that your system needs an inspection.
Wide variance in the cabin temperature: Pay attention to the temperature when you’re driving or riding in the car. If the air temperature swings widely back and forth between hot and cold, the receiver dryer might be struggling.
Mold or mildew smell: An old receiver dryer might not be doing its job of removing moisture from the system, so mold and mildew have a chance to grow. If you notice lingering smells when you turn on the AC, get it checked out.
AC maintenance history: If it’s been more than three years since you’ve had the AC serviced, the receiver dryer almost definitely needs to be replaced.
How often should a receiver dryer be replaced?
A receiver dryer typically lasts three years before the desiccant pellets inside it become useless. Experts recommend that you get your car’s AC serviced once a year, so check the receiver dryer during the annual inspection.
Can I replace the receiver dryer myself?
Since the coolant must be drained in order to replace the dryer, this is a job best left to the professionals. Hire a certified technician trained to work on air conditioners, and they’ll get the job done in no time.