Parts for your 2020 Mitsubishi Asx-Radiator hose

2020 Mitsubishi ASX Radiator Hose — Purpose, Service and Replacement

Technical sources confirm the 2020 Mitsubishi ASX uses conventional upper and lower radiator hoses. The Mitsubishi Motors Service Manual for the ASX/RVR platform (GA2W/GA3W), the Mitsubishi ASA parts catalogue, and aftermarket application data from Gates and Dayco all list moulded upper and lower radiator hoses for the 2.0‑litre 4B11 and 2.4‑litre 4B12 petrol engines. So the radiator hose is absolutely relevant to this model.

These hoses carry coolant between the engine and the radiator: the upper hose routes hot coolant out of the cylinder head to the radiator, while the lower hose returns cooled fluid to the water pump. They’re built to handle pressure, vibration and under‑bonnet temperatures, keeping the ASX at its proper operating temperature and protecting the head gasket, thermostat and heater core.

For routine servicing, the cooling system should be inspected at every service interval (typically 10,000–15,000 kilometres in Australia and New Zealand). A technician checks hose condition, clamp tension and any trace of leaks. Telltales include soft spots, cracking, glazing, swelling from oil contamination, bulges near the clamp lands, dried coolant crust, or a hose that collapses when the engine is revved. Any of these call for replacement.

Because rubber ages from heat cycles, many workshops recommend proactively replacing radiator hoses and clamps at around 6–10 years or 100,000–160,000 kilometres, even if they look fine. When hoses are renewed, fresh coolant should be used that meets Mitsubishi specifications—typically Mitsubishi Genuine Long Life Coolant (blue), mixed 50/50 with demineralised water if not pre‑mixed.

Best practice is to drain the coolant, remove intake ducting as required, release the spring clamps, twist the old hose to break the seal, and fit the new moulded hose in the same orientation. Spring‑type clamps are preferred for steady clamping force. After refilling, bleed the system with the heater on hot until air is purged, verify the radiator fan cycles, then recheck levels and for leaks after a complete heat‑soak.

Common symptoms that suggest attention under the bonnet include:

• Temperature gauge climbing or erratic heater performance
• Sweet coolant smell or green/blue residue around hose ends
• Puddles under the front bumper or visible steam

How often should the radiator hoses be replaced on a 2020 Mitsubishi ASX?

Hoses should be inspected at every service and typically replaced proactively at 6–10 years or 100,000–160,000 kilometres, or immediately if there are signs of softness, cracking, swelling, leaks or collapsing. Climate, driving load and maintenance history can shorten that window.

What coolant should be used after replacing hoses on a 2020 ASX?

Use coolant that meets Mitsubishi specifications, commonly Mitsubishi Genuine Long Life Coolant (blue). A 50/50 premix is ideal, or mix concentrate with demineralised water. Expect roughly 6–7 litres for a full drain and refill, then bleed the system thoroughly.

Can a universal flexible hose be used instead of a moulded ASX hose?

A moulded EPDM hose shaped specifically for the ASX is preferred for correct routing, clamp land alignment and vibration control. Universal flex hoses may work as a temporary fix but aren’t recommended long‑term due to potential kinking and reduced durability.