Where is the AC accumulator located?
In most passenger cars, the AC accumulator sits on the low‑pressure side of the air conditioning system and is typically mounted in the engine bay, most often on the passenger side near the firewall along the line from the evaporator.
What the AC accumulator does
The accumulator (also called the accumulator/drier) stores liquid refrigerant, filters debris, and absorbs moisture from the refrigerant before it flows to the evaporator. It helps protect the compressor from moisture and contaminants and ensures proper refrigerant flow in systems using R‑134a or R‑1234yf.
Location options in different vehicles
Common mounting locations for the accumulator vary by design and model. The following spots cover the most typical layouts you’ll encounter in modern cars:
- Passenger-side firewall area near the evaporator housing in the engine bay (by far the most common location).
- Along the suction line to the compressor, often near the right-hand fender or along the back side of the engine bay.
- Some vehicles place the accumulator inside the engine compartment near the heater box or under the dash; this is less common but exists on certain models.
- Note: in some systems, a receiver-drier is used instead of an accumulator, and those components are typically located near the condenser at the front of the vehicle.
Knowing these typical placements can help you locate the component when servicing the A/C system. If your vehicle uses a receiver-drier rather than an accumulator, refer to the specific service manual for exact location.
How to identify and locate it on your vehicle
- Open the hood and locate the A/C compressor; trace the low-pressure suction line that runs from the evaporator toward the compressor. The accumulator is usually installed along or near this line.
- Look for a cylindrical canister, typically metal or plastic, with two hose connections and sometimes a service port. It’s generally about the size of a soda can or slightly larger.
- Check the area near the passenger-side firewall in the engine bay; if you don’t see it there, inspect the space around the right fender well or along the heater/evaporator housing. If you still can’t find it, consult the owner’s manual or a repair guide for your exact make/model.
When inspecting, also ensure the system is not under pressure and follow safety precautions—A/C components operate under high pressure and can cause injury if mishandled. If you’re planning to replace or evacuate the system, professional service is recommended.
Summary
The AC accumulator is a low‑pressure side component most commonly located on the passenger side of the engine bay near the firewall, along the line from the evaporator to the compressor. While this placement covers the majority of vehicles, some designs place the accumulator elsewhere or substitute a receiver-drier in place of the accumulator. Always consult your vehicle’s service manual for the exact location and handling procedures for servicing the A/C system.
