Parts for your 2018 Mitsubishi Asx-Radiator hose

2018 Mitsubishi ASX Radiator Hose — Purpose, Care and When to Replace

Technical sources confirm the 2018 Mitsubishi ASX uses radiator hoses. The Mitsubishi Motors service manual for the ASX’s liquid-cooled MIVEC petrol engines (Cooling System section) and the Mitsubishi ASA parts catalogue list an upper and a lower radiator hose routing coolant between the engine and the front-mounted aluminium radiator. These components are standard across the ASX/Outlander Sport/RVR line-up for this model year, making the radiator hose a relevant, fitted part on every 2018 ASX with an internal-combustion engine.

The radiator hose pair does a simple but critical job: they move hot coolant from the engine to the radiator to shed heat, then return cooled fluid back to the block. Built from heat- and pressure-rated rubber with shaped bends, they manage engine vibrations, temperature swings, and pressure pulses while the ASX cruises city streets or clocks up country kilometres. Without healthy hoses, the cooling system can’t stabilise engine temperature, risking overheating and costly damage under the bonnet.

Good servicing habits keep the ASX’s radiator hoses in top nick. Most workshops in Australia and New Zealand suggest proactive replacement about every 5–7 years or 100,000–150,000 km, sooner in harsh heat or stop–start use. During routine services, hoses should be checked for softness, swelling near the ends, cracking, glazing, oil contamination, or seepage at clamps. When replacement is due, quality OEM-spec hoses and new clamps are wise choices, and mixing fresh coolant that meets Mitsubishi’s spec helps protect the new rubber from chemical attack.

Signs of trouble and easy checks owners can request during servicing:

• Temperature gauge creeping high, heater going cold at speed, or a sweet coolant smell after parking.
• Visible leaks, white crust, or dried pink/green residue at hose joints and under the vehicle.
• Hose feels spongy or excessively hard when squeezed (engine cold only).

When fitting new hoses, correct clamp positioning and tension matter—spring clamps are often preferred as they maintain pressure with heat cycling. After refilling, the cooling system must be bled properly to remove air pockets, and the cap and thermostat should be inspected. A short post-service road test, plus a level check of coolant once cooled, rounds out a tidy job that keeps the ASX running cool and reliable.

How often should the radiator hoses be replaced on a 2018 Mitsubishi ASX?

Most technicians recommend replacement every 5–7 years or around 100,000–150,000 km. If the vehicle tows, sees high ambient heat, or mostly does short trips, hoses can age faster and warrant earlier change. Regular inspections during scheduled servicing catch issues before they become breakdowns.

What coolant should be used, and does it affect hose life?

Use a Mitsubishi-approved long-life, ethylene glycol–based coolant mixed to the correct ratio. The right chemistry protects aluminium components and the hose material from swelling or internal degradation. Avoid mixing types, if unsure, have the system flushed and refilled with the specified coolant.

Can radiator hoses be changed at home, or is a workshop best?

Competent DIYers can replace hoses with basic tools, a drain pan, and care taken to bleed air from the system. However, many owners prefer a workshop so coolant handling, clamp tensioning, and leak checks are done by the book, and old coolant is disposed of responsibly.