Parts for your 2018 Mitsubishi Asx-Ac compressor

2018 Mitsubishi ASX AC compressor — what it does and how to look after it

Drawing on technical sources — including the Mitsubishi Motors Service Manual (Heating & Air Conditioning section for ASX/RVR/Outlander Sport), the Mitsubishi ASA electronic parts catalogue for 2018 ASX models sold in Australia and New Zealand, and supplier documentation from Denso/Sanden for belt-driven variable-displacement units used with the 4B11 2.0L engine — the 2018 Mitsubishi ASX is fitted with an air-conditioning compressor. It’s a conventional, engine-driven unit mounted by a serpentine belt, so it’s absolutely relevant to A/C performance on this vehicle.

The A/C compressor is the heart of the ASX’s climate system. It pressurises refrigerant and keeps it circulating through the condenser, expansion device and evaporator, pulling heat and moisture from the cabin. On the road, that means quick demist performance on a soggy winter morning and crisp cooling on a scorching arvo. The ASX’s compressor is designed to modulate output, so it can maintain stable cabin temps without constantly cycling on and off.

As part of regular servicing, a few simple checks go a long way. Inspect the drive belt for cracks or glazing and confirm correct tension. Keep an ear out for chirps or growls from the compressor clutch or front bearing. Make sure there are no oily residues on A/C hoses or fittings, which can hint at refrigerant leaks. It’s smart to run the A/C for at least 10 minutes weekly, even in winter, to keep seals lubricated.

• Tell-tale signs of compressor trouble: weak cooling, intermittent cold air, metal swarf in the A/C circuit, clutch not engaging, or a loud knock/whine with A/C on.
• Good workshop practice: recover and weigh refrigerant, replace the receiver-drier or desiccant, flush lines if there’s any debris, renew O-rings, add the correct PAG oil type/quantity, and pull a proper vacuum before recharging.

If replacement is needed, it pays to use quality parts and have the job handled by an ARCtick-licensed technician. In AU/NZ, many 2018 ASX vehicles use R134a, but always confirm the refrigerant and charge amount on the under‑bonnet label. After fitment, verify clutch engagement, pressures, vent temps and that the radiator fans stage correctly. A tidy install and correct charge protect the new compressor and keep the ASX cooling like it should.

Popular questions about the 2018 Mitsubishi ASX A/C compressor

How long should the ASX A/C compressor last?
With regular use and clean system conditions, many see 8–12 years. Heat, infrequent use, contaminated oil, or running low on refrigerant can shorten that.

What does a replacement typically cost in AU/NZ?
As a ballpark, parts and labour can land around AUD/NZD $900–$1,800 depending on brand, shop rates, and whether extras like a drier and flush are included.

Does the 2018 ASX use R134a or R1234yf?
Most Australian and New Zealand 2018 ASX models use R134a. Always confirm on the vehicle’s refrigerant label and follow that specification.