Parts for your 2010 Mitsubishi Lancer-Thermostat

2010 Mitsubishi Lancer Thermostat

Yes, a thermostat is fitted to the 2010 Mitsubishi Lancer. This is confirmed by Mitsubishi Motors workshop literature for the CJ/CY/CZ Lancer (Cooling System section), the Mitsubishi ASA electronic parts catalogue, and major aftermarket catalogues (e.g., Tridon and Gates) that list a dedicated thermostat assembly for the 1.8, 2.0 and 2.4 petrol engines used in this model.

The thermostat’s job is to help the engine warm up quickly and then hold it at a steady operating temperature. It stays shut when the engine is cold, then opens around its rated temperature (typically about 82–88°C depending on engine and market) to let coolant circulate through the radiator. That stable temperature means better fuel economy, nicer heater performance on cold mornings, and less engine wear.

As part of regular servicing on a 2010 Lancer, the thermostat isn’t a routine “every service” replacement item, but it should be checked any time the cooling system is worked on or if there are temperature concerns. When doing a coolant change, it’s smart to inspect the thermostat housing and O-ring for leaks or crusty deposits, and to confirm the radiator hose warms evenly once the engine reaches operating temp. Many owners also choose to replace the thermostat proactively at higher kilometres or when chasing a P0128 code (coolant temperature below thermostat regulating temperature).

Common signs the thermostat may be due include:

• Engine takes ages to warm up, heater stays lukewarm
• Temp gauge climbs or drops unexpectedly, or fluctuates on the open road
• Cooling fans running more than usual, or a check engine light with temperature-related codes
• Overheating under load or when idling on a warm day

Replacement is straightforward for a competent DIYer: work on a cold engine, relieve pressure, drain enough coolant to drop the level below the housing, then remove the lower radiator hose/thermostat housing under the bonnet. Fit a quality thermostat to the correct orientation with a fresh seal, torque the housing to the factory spec, refill with Mitsubishi-approved blue long-life coolant (50/50 with demineralised water), and bleed air from the system. After a test drive, recheck the coolant level and hose connections. If unsure, it’s worth organising a workshop to handle it—cooling issues can get costly if they’re not sorted properly.

Does the 2010 Mitsubishi Lancer have a thermostat and where is it located?

It does. The thermostat sits in a housing at the engine end of the lower radiator hose. On most 1.8–2.4 petrol Lancers, it’s mounted low on the engine block side. Access is from the top with the bonnet open, though removing intake ducting may give more room.

What temperature thermostat does a 2010 Lancer use?

Most 2010 Lancer petrol engines use a thermostat that begins opening around 82–88°C. The exact spec can vary by engine code and market, so it’s best to match against the VIN or engine code and follow the workshop manual or a reputable parts catalogue.

When should the thermostat be replaced?

Replace it if there are symptoms (slow warm-up, overheating, P0128, or leaks), when the housing or water pump work is being done, or as preventative maintenance at higher kilometres. Always renew the seal/O-ring and refill with the correct blue long-life coolant, bleeding the system thoroughly.