Parts for your 2020 Mitsubishi Eclipse cross-Thermostat housing

2020 Mitsubishi Eclipse Cross Thermostat Housing

Yes, the 2020 Mitsubishi Eclipse Cross is fitted with a thermostat housing. This is confirmed by Mitsubishi’s factory Workshop/Service Manual for the Eclipse Cross (GK chassis, Cooling System – Thermostat section) and the Mitsubishi ASA electronic parts catalogue, which lists a “water outlet/thermostat housing” assembly for GK1W/GK9W models (1.5‑litre turbo petrol and applicable diesel variants). Those technical sources identify the housing as the mounting and coolant outlet for the engine thermostat, with an integrated seal and hose connection.

On this model, the thermostat housing holds the thermostat in place and directs coolant flow from the engine to the radiator once operating temperature is reached. It’s a small part with a big job: helping the engine warm up quickly, then keeping temperatures stable in Aussie and Kiwi conditions, whether that’s creeping in city traffic or heading up the hills. Many Eclipse Cross vehicles use a composite (glass‑filled nylon) housing with an O‑ring seal and a connection for the upper radiator hose, and the thermostat is often supplied as an assembly with the housing and seal.

As part of routine servicing, it’s smart to keep an eye on the housing and surrounding plumbing. Look for tell‑tales like dried coolant residue (white/green crust), pinkish staining, or dampness around the join. If the gauge wanders, the heater goes cold under load, or it takes ages to reach temp, the thermostat or its housing could be the culprit.

• Inspect at each service when the coolant is checked, pay special attention from about 100,000 km or five years onward.
• Replace the housing and thermostat as an assembly if there’s warping, cracking, corrosion on metal inserts, or recurring leaks.
• Always fit a new O‑ring/gasket and clean mating faces, torque fasteners to the specs in the Mitsubishi workshop manual.
• Refill with Mitsubishi‑approved long‑life coolant at the correct concentration and bleed the system to remove air.

Most workshops allow around an hour for access, swap‑over, refill and bleed, depending on model packaging. Under the bonnet, the housing is typically located where the upper radiator hose meets the engine. Using genuine or quality aftermarket parts and the right coolant helps the Eclipse Cross maintain steady temps, better fuel economy, and long engine life.

Where is the thermostat housing on a 2020 Eclipse Cross?
It’s usually found at the end of the upper radiator hose where it meets the engine, acting as the outlet for coolant leaving the cylinder head. Access is from the top of the bay once the engine cover is off.

What are common signs the housing or thermostat needs attention?
Slow warm‑up, fluctuating temperature, poor heater performance, or visible coolant residue around the housing. Any cracking, warping, or a flattened O‑ring calls for replacement.

What coolant should be used and how is air bled?
Use Mitsubishi‑approved long‑life ethylene‑glycol coolant at the specified mix. After refilling, run the engine with the heater on hot, allow the thermostat to open, top up the reservoir as bubbles purge, then recheck levels once cool.