Parts for your 2014 Mitsubishi Outlander-Thermostat housing

2014 Mitsubishi Outlander thermostat housing — what it is and how to look after it

Based on technical sources, the 2014 Mitsubishi Outlander is fitted with a thermostat housing. Mitsubishi Motors’ Service Manual (Group 14: Cooling, applicable to 2013–2016 Outlander) details a thermostat located within a water outlet/thermostat housing assembly across the petrol 2.0L (4B11), 2.4L (4B12), 3.0L V6 (6B31) and 2.2L diesel (4N14) engines. The Mitsubishi ASA electronic parts catalogue lists corresponding “water outlet/thermostat housing” assemblies (e.g., typical OEM numbers in the 1305A*** series). These factory references confirm the part is relevant and used on the 2014 Outlander.

The thermostat housing on a 2014 Outlander holds the thermostat, channels coolant between the engine and radiator, and commonly provides mounting for the engine coolant temperature sensor and hose connections. It’s a hard-working bit of gear that sees constant heat cycles, so keeping it healthy helps the Outlander warm up quickly, hold a steady temp in traffic, and shed heat on long, hot Kiwi and Aussie runs.

During regular servicing, it’s smart to inspect the housing area for stains, crusty residue, or dampness around the hose neck and gasket/O-ring. The housing is usually a composite plastic or alloy casting at the engine end of the upper radiator hose. If there’s any cracking, warping, or persistent weeping, replace the housing rather than trying to nurse it along. Always refresh the thermostat seal/O-ring whenever the assembly is opened.

• Common clues it needs attention:
  • Coolant smell, pink/green/blue residue, or drips under the nose of the car
  • Overheating or running cold for too long, heater going lukewarm, or erratic temp gauge
  • Low coolant warning with no obvious external hose failure

Replacement is straightforward for a competent DIYer but do follow the workshop specs. Work on a cold engine, drain enough coolant to sit below the housing level, and disconnect the upper hose. Unbolt the housing, swap in a new thermostat and seal if required, and fit a new housing if the old one’s damaged. Clean the mating surfaces, use the correct gasket/O-ring, and torque the bolts to the spec in the service manual—don’t overtighten plastic/composite housings. Reconnect hoses, refill with the correct Mitsubishi-approved long-life coolant mix, and bleed air per the manual. After a shakedown drive, recheck the level and look for any seepage.

There’s no fixed replacement interval for the housing itself, but it’s sensible to assess it at every coolant change and replace it if there’s any doubt. Doing the thermostat and housing together can save repeat labour and reduce the chance of niggling leaks down the track.

Popular questions

Does the 2014 Outlander actually have a thermostat housing?

Yes. Factory documentation (Mitsubishi Motors Service Manual, Group 14: Cooling) and the Mitsubishi ASA parts catalogue show a dedicated water outlet/thermostat housing assembly on the 2014 Outlander’s 2.0, 2.4, 3.0 V6, and 2.2 diesel engines. It’s the bit that holds the thermostat and connects the upper radiator hose.

Where is the thermostat housing on a 2014 Outlander?

It’s typically found at the engine end of the upper radiator hose under the bonnet. On the 4-cylinder petrols it’s at the front of the engine near the timing cover