Parts for your 2016 Mitsubishi Asx-Radiator cap

2016 Mitsubishi ASX radiator-cap: what it does, why it matters, and when to replace it

Based on Mitsubishi Motors’ ASX/RVR 2015–2017 Service Manual (Cooling System), the Mitsubishi ASA Electronic Parts Catalogue for GA-model ASX, and Australian/NZ application catalogues from Gates and Dayco, the 2016 Mitsubishi ASX is fitted with a conventional, pressurised radiator cap (about 1.1 bar) on the radiator neck. So the radiator-cap is absolutely relevant to this model.

On a 2016 ASX, the radiator-cap keeps the cooling system sealed and pressurised so coolant can run hotter without boiling, which helps control engine temps under load and on scorching Aussie or Kiwi days. It has two valves: a pressure valve that holds roughly 1.1 bar before lifting to vent excess pressure to the overflow bottle, and a vacuum valve that draws coolant back from the bottle as the engine cools. That in–out action keeps the cooling system full and happy.

Because the cap is a small part doing a big job, it deserves a quick look during regular servicing. A crook cap can cause hard hoses, slow overheating, gurgling after shutdown, or a sweet coolant whiff around the front end. It’s smart to:

• Inspect the rubber seal and spring for cracks, flattening or corrosion.
• Check for white crust or staining around the cap or filler neck.
• Pressure-test the cap during a coolant service, replace if it won’t hold the rated pressure.

Good practice in Australian and New Zealand conditions is to check the radiator-cap at least annually and replace it every 3–5 years, or sooner if testing shows it’s weak. Always match the pressure rating on the old cap or as specified in the service manual (typically around 108 kPa/1.1 bar for ASX) and use quality OEM or equivalent.

1. Only open the radiator-cap when the engine is completely cold.
2. Wrap a rag around the cap and turn slowly to the first stop to bleed any residual pressure.
3. Clean the filler neck, fit the new cap squarely, and turn fully until it seats.
4. Top up the overflow bottle to the correct mark and monitor levels over the next few drives.

Done right, a fresh, correctly rated radiator-cap helps the 2016 Mitsubishi ASX keep its cool, protects the head gasket, and extends coolant life between services.

Does the 2016 Mitsubishi ASX have a radiator-cap or only a reservoir?

Yes, it uses a pressurised radiator-cap on the radiator neck. The adjacent plastic bottle is an overflow tank and isn’t pressurised. The cap controls system pressure and draws coolant back from the bottle as the engine cools.

What pressure radiator-cap does a 2016 ASX need?

Most Australian/New Zealand 2016 ASX variants use a 1.1 bar (approx. 108 kPa) cap. Always confirm by reading the stamping on the existing cap or checking the Mitsubishi service manual/parts catalogue for your VIN. Using the wrong pressure rating can cause leaks or overheating.

How often should the radiator-cap be replaced on a 2016 ASX?

Have it inspected at every service and pressure-tested at coolant changes. In local conditions, replacement every 3–5 years is sensible, or immediately if testing fails or there are signs of wear, corrosion, or persistent coolant loss.