Parts for your 2016 Mitsubishi Asx-Thermostat housing

2016 Mitsubishi ASX Thermostat Housing

Based on technical sources, the 2016 Mitsubishi ASX does use a thermostat housing. Mitsubishi’s service literature for the ASX/Outlander Sport/RVR (GAxW series, Group 14 – Cooling), the Mitsubishi ASA electronic parts catalogue, and mainstream OEM part catalogues (e.g., Gates and Dayco) show a bolt-on thermostat housing—also called the water inlet—fitted to petrol engines like the 4B11 (2.0L) and 4A92 (1.6L), as well as the diesel 4N13. These documents outline the housing as the mounting point for the thermostat and a junction for coolant flow and, on some variants, the coolant temperature sensor.

The thermostat housing on a 2016 Mitsubishi ASX keeps the engine’s temperature sweet-spot in check. It holds the thermostat, directs coolant between the block and radiator, and often provides the port for the temperature sensor. When it’s doing its job, the ASX warms up quickly, runs efficiently, and doesn’t overheat on a hot Aussie or Kiwi arvo.

Owners will find the housing near the lower radiator hose connection at the front/side of the engine. Materials vary—some are cast alloy, others are a durable composite—so the housing resists corrosion while sealing neatly with an O-ring or gasket. Over time, heat cycles and old coolant can harden seals, and plastic flanges can warp or crack, leading to minor seepage or annoying drips.

As part of normal servicing, the housing isn’t usually on a fixed replacement schedule. It’s smart, though, to give it a once-over during coolant changes and major services. Look for white or pinkish crust around the flange, a sweet coolant smell, or any dampness underneath the housing. A wandering temp gauge, slow warm-up, weak cabin heat, or sudden hot running can also hint at thermostat or housing issues.

• Best practice at replacement:
  • Always fit a new thermostat O-ring/gasket and clean the mating surfaces.
  • Tighten bolts evenly to spec to avoid warping the housing.
  • Refill with the correct Mitsubishi long-life coolant (blue), bleed air per the workshop manual, and check for leaks once hot.
• Helpful checks to combine:
  • Inspect the lower radiator hose and clamps.
  • If fitted, confirm the coolant temp sensor seal is sound.

If the housing is cracked, pitted, or distorted, replace it along with the thermostat. For higher-mileage ASX vehicles, swapping the thermostat preventatively when doing a coolant service can save headaches, especially if there have been any temperature irregularities.

Popular questions about 2016 Mitsubishi ASX thermostat housing

Where is the thermostat housing on a 2016 ASX?
The housing sits where the lower radiator hose meets the engine, typically on the front or side of the block near the water pump. On most 4B11/4A92 engines it’s the bolt-on “water inlet” casting with a hose neck and, on some variants, a sensor boss.

What are the common signs the housing or thermostat needs attention?
Coolant seepage or crust around the housing, a fluctuating temp gauge, slow warm-up, no cabin heat, or overheating. After a drive, a sweet coolant smell or small drops under the front of the engine are classic clues.

Should it be replaced as routine maintenance?
There’s no fixed interval. Inspect at each coolant service (as per the logbook). Replace the thermostat and O-ring if there are symptoms or during major cooling system work, replace the housing if it’s cracked, warped, or corroded.