Parts for your 2017 Subaru Impreza-Ac compressor

2017 Subaru Impreza AC Compressor: What it does and how to look after it

Yes, an AC compressor is absolutely fitted to the 2017 Subaru Impreza. Technical documentation confirms this: the Subaru Factory Service Manual for the 2017MY Impreza (GK/GT) HVAC section specifies a belt‑driven, variable‑displacement compressor mounted to the FB20 engine, and the Subaru parts catalogue lists a “Compressor Assy – Air Conditioner” for this model. DENSO service literature also covers the electronically controlled displacement valve used on compressors commonly fitted to Subaru applications of this era.

The AC compressor is the heart of the Impreza’s climate control. It pressurises and circulates refrigerant, allowing heat to be absorbed from the cabin and rejected at the condenser up front. On the 2017 Impreza, the variable‑displacement design efficiently adjusts output to match demand, helping the car cool quickly on hot Aussie and Kiwi days and clear fog from the windscreen in damp weather. Many variants use a magnetic clutch, all rely on a control valve to modulate flow and keep things smooth and efficient.

As part of regular servicing, it pays to keep the compressor happy. Practical tips include:

• Run the air‑con for 10–15 minutes weekly year‑round to circulate oil and keep seals supple.
• Keep the condenser clean and the drive belt in good nick, replace the cabin filter as scheduled to reduce system load.
• Have a licensed air‑conditioning technician perform a leak check and performance test every 1–2 years. Re‑gas only when needed after proper diagnosis.

When replacement is on the cards—signs include persistent poor cooling with the correct charge, rough or noisy operation, metal debris in the system, a seized shaft, clutch slip, or a faulty control valve—best practice matters. A proper job involves refrigerant recovery, replacing the receiver/drier or desiccant bag, renewing O‑rings, adding the exact type and quantity of PAG oil, evacuating to deep vacuum, and recharging to the label‑specified refrigerant mass under the bonnet. Flushing lines and inspecting the expansion device and condenser are wise if there’s been internal wear. After refit, a leak test and system relearn or code clear (if applicable) finish it off.

Always use the refrigerant and oil specified for the vehicle and local market, and engage an ARCtick‑licensed (AU) or appropriately certified (NZ) technician. Cutting corners with “top‑ups” or the wrong oil can shorten compressor life and cost more down the track.

Popular questions about the 2017 Subaru Impreza AC compressor

Which refrigerant does the 2017 Impreza use?
It depends on market and build. Some 2017 vehicles use R‑134a, others use R‑1234yf. The correct information is printed on the under‑bonnet air‑conditioning label. Always match the refrigerant and oil type to that label and the service manual.

How long should the compressor last?
With regular use and proper servicing, many last 8–12 years or more. Heat, infrequent operation, dirty condensers, incorrect oil, or leaks can shorten lifespan. Running the system periodically and keeping the condenser clean helps longevity.

Can the control valve be replaced instead of the whole compressor?
In some cases, yes—the electronically controlled displacement valve can be replaced to restore performance. If there’s internal wear or metal debris, a full compressor replacement and system clean is the safer bet to avoid repeat failures.