Parts for your 2019 Mitsubishi Eclipse cross-Thermostat

2019 Mitsubishi Eclipse Cross Thermostat — What It Does and When to Replace It

Technical sources confirm the 2019 Mitsubishi Eclipse Cross is fitted with an engine coolant thermostat. The Mitsubishi Motors Workshop Manual for the GK/GL-series (Cooling System section), the Mitsubishi ASA electronic parts catalogue, and common aftermarket catalogues (e.g., Gates/Dayco listings for the 1.5L 4B40 turbo petrol) all show a thermostat integrated into the water outlet housing. So yes—this model uses a thermostat, and it’s a relevant service item.

The thermostat’s job is simple but vital: help the engine warm up quickly, then keep it at a stable operating temperature. On the Eclipse Cross’s 1.5‑litre turbo, the wax‑pellet thermostat modulates coolant flow to the radiator so the engine doesn’t run too cold on winter mornings or cook itself in summer traffic. The result is smoother running, better fuel economy, and reduced emissions—plus reliable cabin heat when it’s chilly across Aus or NZ.

It’s not a regular “replace by X kilometres” item, but it should be checked whenever coolant is serviced. If the temp gauge swings about, the heater is weak, the car takes ages to warm up, or it’s trending hot, the thermostat could be sticking. A check-engine light with a P0128 code (coolant temp below thermostat regulating temperature) is another giveaway.

Replacement is straightforward for a trained tech. The thermostat lives in the coolant outlet housing (follow the upper radiator hose back to the engine). Many versions are sold as a complete housing-and-thermostat assembly, which is handy for preventing leaks. A fresh O‑ring/gasket is a must, and it’s good practice to refill with the correct Mitsubishi-approved long‑life coolant. Bleeding the system properly—heater on hot, bleed points used where fitted—keeps air pockets from causing hot spots under the bonnet.

There’s no harm in a proactive replacement at high mileage—say, 150,000–200,000 km or around the 8–10‑year mark—especially if the cooling system is being refreshed. Always work on a cold engine, dispose of old coolant responsibly, and torque bolts to spec from the workshop manual.

• Common signs: slow warm‑up, fluctuating temp gauge, overheating, poor heater, fault code P0128.
• Best time to assess: during coolant changes or if any cooling system work is being done.
• Good practice: replace the housing assembly if specified, fit a new seal, and bleed carefully.

Does the 2019 Eclipse Cross have a thermostat?

Yes. Factory documentation (Mitsubishi Workshop Manual) and parts catalogues (Mitsubishi ASA and major aftermarket listings) specify a thermostat in the coolant outlet for the 1.5L turbo engine, making it a standard, serviceable component.

Where is the thermostat located?

It’s in the coolant outlet housing on the engine—trace the top radiator hose back to the engine and you’re there. Many models use a housing-and-thermostat combo, which simplifies replacement and helps prevent future leaks.

Do I need to replace coolant when changing the thermostat?

Coolant will be lost during the job, so it’s smart to refill with fresh, manufacturer‑approved long‑life coolant and bleed the system properly. Doing the thermostat when you’re due for a coolant service is a tidy, cost‑effective approach.