Parts for your 2014 Mitsubishi Asx-Thermostat

2014 Mitsubishi ASX Thermostat — Purpose, Care, and When to Replace

Based on Mitsubishi’s factory service manuals for the GA-series ASX (RVR/Outlander Sport), OEM parts catalogues (ASA/CAPS), and mainstream aftermarket catalogues, the 2014 Mitsubishi ASX is fitted with a conventional wax‑pellet engine coolant thermostat. So yes, a thermostat is absolutely relevant and serviceable on this model.

The thermostat’s job is simple but crucial. It keeps coolant flow restricted while the engine warms up, helping the ASX reach operating temperature quickly for better fuel economy, smoother running, proper cabin heat and lower emissions. Once warm, it meters coolant to the radiator to hold a steady operating temp, protecting the engine from both overcooling and overheating.

For everyday servicing, owners should think of the thermostat as part of the broader cooling system. Fresh coolant matters just as much as a healthy thermostat. Use a quality long‑life coolant that meets Mitsubishi specifications (the blue Super Long Life style is the usual pick), mixed correctly, and change it at the recommended interval. Any time the cooling system is opened, check hoses, clamps, the radiator cap, and the thermostat housing O‑ring.

• Typical warning signs of a tired thermostat:
  • Slow warm‑up, poor heater output, or the temp gauge sitting low (stuck open).
  • Overheating or a rapid temp rise after cold start (stuck closed).
  • Temperature swings at highway speed or under load.

There’s usually no fixed replacement interval, but on an older ASX it’s sensible to replace the thermostat proactively around the 8–10 year or 150,000–200,000 km mark, or whenever the housing is off for other cooling work. Always match the correct opening temperature spec (commonly around 82°C for petrol variants) and fit a new O‑ring or gasket.

When replacing, start with a stone‑cold engine. Drain enough coolant to sit below the thermostat level, remove the lower radiator hose/housing, note the thermostat orientation, and clean the mating surfaces. Fit the new unit with a fresh seal, tighten the housing bolts to spec, refill with the right coolant mix, bleed any air, and confirm both radiator fans cycle and the heater blows hot under the bonnet closed. A quick road test should show a stable gauge and no leaks. Done right, the ASX will warm up smartly and hold temperature rock‑solid, even on a scorching Aussie or Kiwi summer’s day.

• Where is the thermostat on a 2014 Mitsubishi ASX?

On most 2.0L petrol ASX models, it’s housed at the water inlet where the lower radiator hose meets the engine, on the front side of the block. Diesel layouts may differ slightly, but it’s still in the coolant inlet/outlet housing. Look for the alloy housing secured with a couple of bolts and an O‑ring seal.

• What temperature does the ASX thermostat open?

For many 2014 ASX petrol engines the opening temperature is around 82°C, with full open a few degrees higher. Always confirm against the exact engine code and parts listing for the vehicle, as some markets and engines can vary.

• How often should the thermostat be replaced?

There’s no strict schedule. Replace it if there are symptoms, any time the housing is off, or as preventative maintenance every 8–10 years or roughly 150,000–200,000 km. Pairing a new thermostat with a coolant service is a smart move to keep temperatures stable.