Parts for your 2016 Suzuki Splash-Thermostat

2016 Suzuki Splash thermostat — what it does and how to look after it

Referencing technical sources, this vehicle absolutely uses a thermostat. The Suzuki workshop manual for Splash/Ritz models (K10B/K12B petrol and D13A diesel) details a wax‑pellet thermostat in the coolant housing, with an opening specification around the low‑80s °C and fully open in the mid‑90s °C. Suzuki’s Electronic Parts Catalogue lists a dedicated thermostat assembly for the Splash/Ritz engines, and major application catalogues from Tridon (AU/NZ), Gates, and Mahle/Behr all specify a replacement thermostat for 2008–2016 Splash/Ritz variants. So, on a 2016 Suzuki Splash (often badged as Maruti Ritz in some markets), a thermostat is fitted and it’s central to stable engine temperature and cabin heating.

On this little Suzuki, the thermostat speeds warm‑up after a cold start, then meters coolant flow so the engine sits right on its designed operating temperature. That keeps fuel economy tidy, emissions low, and the heater nice and toasty on a chilly morning. If the thermostat sticks closed, it can overheat, if it sticks open, the Splash can run too cool, chew more fuel, and throw a P0128‑type fault for “coolant temperature below regulating temperature”.

As part of routine servicing, most techs don’t replace the thermostat by time alone, but they do inspect operation whenever cooling system work is done or if there are symptoms. It’s smart to replace it proactively when doing a coolant change on an older or high‑kilometre car, or any time the water pump or radiator is being serviced, because the part is inexpensive and the housing is already open. Use a quality thermostat to the factory spec temperature, fit a new gasket/O‑ring, and refill with the correct long‑life ethylene glycol coolant (commonly a blue or green OAT/HOAT depending on market spec). Bleed the system properly to avoid air pockets, then verify with a scan tool that warm‑up is smooth and stable during a road test.

• Typical signs it’s due: slow warm‑up, erratic gauge, poor heater output, overheating, or a P0128 code.
• Location: in the coolant housing at the engine end of a radiator hose (varies by engine variant).
• Good practice: pair a thermostat change with fresh coolant and a new radiator cap check.
• Torque the housing bolts to spec and don’t over‑seal, the O‑ring does the sealing.
• Dispose of old coolant responsibly, it’s toxic and not pet‑safe.

Popular questions about the 2016 Suzuki Splash thermostat

Where is the thermostat on a 2016 Suzuki Splash?

It sits inside the coolant housing at the engine end of one of the main radiator hoses. On most K12B petrol models, that housing is at the lower side of the engine, accessible from above with the airbox out or from underneath with the splash shield off.

Look for the hose that feeds the engine, the thermostat lives right behind that housing, secured with a couple of bolts and sealed by an O‑ring.

What symptoms point to a failing thermostat?

Slow warm‑up, a temp gauge that never quite gets to the middle, poor heater output, or a P0128 code suggests it’s stuck open. Rapid temp rise, boiling coolant, or hose collapse points to stuck closed or a flow issue.

Any of these warrant a cooling system check, including the thermostat, radiator cap, coolant condition, and fan operation.

Should it be changed during a coolant service?

Not always, but it’s a smart add‑on for higher‑kilometre cars or if there have been any temperature irregularities. The part is affordable, and doing it while the system is drained saves time later.

When replacing, use the correct temperature‑rated unit, renew the O‑ring, and bleed the system carefully to avoid air locks.