Parts for your 2020 Subaru Impreza-Receiver driers

2020 Subaru Impreza receiver–drier: what it does and when to replace it

For the 2020 Subaru Impreza, the receiver–drier absolutely is part of the air‑con system—it's just not a separate canister any more. Subaru integrates the drier (desiccant) into the condenser assembly on this model. That’s confirmed by Subaru factory service information for the 2017–2021 Impreza HVAC system (Condenser section) and matching Subaru parts catalogues that list the condenser as including the desiccant/receiver function. On many VINs, Subaru supplies a serviceable desiccant bag kit, otherwise, the condenser is replaced as a unit.

What does it actually do? The receiver–drier sits on the high‑pressure side, after the condenser and before the thermal expansion valve (TXV). Its job is two‑fold: store and smooth the flow of liquid refrigerant, and trap moisture and debris using a desiccant and filter. Moisture is the enemy of any air‑con system—left unchecked it forms acids and ice crystals, which can score the compressor, clog the TXV, and generally make a mess of cooling performance.

Unlike engine oil or filters, the drier isn’t a routine, kilometre‑based service item. It’s replaced based on the air‑con work being done and the system’s condition. For a 2020 Impreza, a licensed air‑con tech will typically recommend replacing the desiccant bag (or the condenser if the bag isn’t serviceable) whenever the system is opened to atmosphere or if there’s evidence of contamination.

• Replace the receiver–drier/desiccant when: the compressor is replaced, the condenser is replaced (e.g., after a front‑end knock), the system has been open for more than a brief repair, there’s internal debris, burnt oil, or moisture contamination, or a stop‑leak product has been used (not recommended).
• Best practice during service: cap lines immediately when opened, renew all O‑rings, flush lines where appropriate (never flush the TXV, compressor, or drier), evacuate under deep vacuum for 30–60 minutes, and recharge with the exact refrigerant type and mass shown on the under‑bonnet label. Many 2020 Imprezas use R‑1234yf, though some markets run R‑134a—always follow the vehicle label.

Because handling refrigerant is regulated in Australia and New Zealand, all work should be carried out by an ARCtick‑licensed (AU) or appropriately certified (NZ) air‑con technician. That keeps the Impreza’s TXV and compressor protected and the cabin cool on scorching summer runs.

Technical sources: Subaru Service Manual (HVAC > Air Conditioning > Condenser/Receiver) for 2017–2021 Impreza, Subaru Genuine Parts catalogues describing the condenser assembly as incorporating the desiccant/receiver, with service kits available for certain VINs.

Popular questions

Does the 2020 Subaru Impreza have a separate receiver–drier canister?
No. On this model it’s built into the condenser. Depending on VIN, the desiccant bag can be serviced separately, otherwise the condenser is replaced as an assembly.

When should the receiver–drier be replaced on a 2020 Impreza?
Replace the desiccant bag (or condenser) whenever the system is opened, after compressor or condenser replacement, or if there’s moisture or debris in the circuit. It’s not a routine time/kilometre item.

What refrigerant does the 2020 Impreza use?
Check the under‑bonnet label. Many 2020 cars use R‑1234yf, while some markets specify R‑134a. Always charge to the exact mass on the label, and have a licensed tech handle the gas.