Parts for your 2011 Suzuki Splash-Thermostat

2011 Suzuki Splash Thermostat — What it does and when to replace it

Yes, the 2011 Suzuki Splash is fitted with a conventional engine coolant thermostat. This is documented in the Suzuki workshop literature for the Splash/Swift K12B engine (Cooling System section), and the Suzuki Electronic Parts Catalogue lists a thermostat and housing assembly for both the 1.2‑litre petrol (K12B) and the 1.3 DDiS diesel. Major aftermarket catalogues (e.g., Dayco and Gates) also specify direct‑fit replacement thermostats for the 2008–2014 Splash range, confirming its use in this model year.

The thermostat’s job is simple but vital: it helps the Splash warm up quickly and then keeps engine temperature steady. When the engine is cold, the thermostat stays closed so the coolant doesn’t circulate through the radiator, getting the motor up to optimal temperature faster. Once warm, it opens to let coolant flow and prevent overheating. That steady temperature saves fuel, reduces wear, and keeps the cabin heater working properly on chilly mornings across Aus and NZ.

For servicing, there’s no fixed change interval for the thermostat, but most techs recommend assessing it whenever the coolant is replaced (typically every 5 years or 100,000 km, or as per Suzuki’s schedule). If there’s any hint of sticking, leakage, or trouble codes like P0128 (coolant temperature below thermostat regulating temperature), it’s smart to replace the thermostat and gasket/housing together. Fresh coolant and a proper bleed are must‑dos.

• Common signs it’s on the way out:
  • Slow warm‑up, poor heater performance, or fluctuating temp gauge
  • Overheating under load or in traffic
  • Cooling fans running more than usual, or a Check Engine Light with temperature‑related codes

• Handy replacement tips:
  • Start with a cold engine, depressurise the system, and catch old coolant for proper disposal
  • Fit a new seal/O‑ring and clean mating surfaces, don’t over‑tighten fasteners
  • Refill with the correct Suzuki‑approved coolant mix and bleed air from the system
  • After a test drive, recheck the level and inspect for weeps around the housing

Owners who service their Splash regularly and keep the cooling system clean can expect a thermostat to last many years. Still, given how affordable the part is compared to the cost of an overheated engine, preventative replacement when doing major cooling work is often good value.

Popular questions about the 2011 Suzuki Splash thermostat

Does a 2011 Suzuki Splash have a thermostat?
Yes. Both the 1.2‑litre petrol (K12B) and the 1.3 DDiS diesel variants use a wax‑element thermostat in a dedicated housing. This is supported by Suzuki’s service manual procedures and parts listings for the model year.

How often should the thermostat be replaced?
There’s no strict interval. Inspect it whenever coolant is changed (about every 5 years/100,000 km). Replace it if the engine warms slowly, overheats, the temp gauge wanders, or if diagnostic code P0128 appears. Many workshops replace the thermostat preventatively when doing radiators, water pumps, or major cooling repairs.

Where is the thermostat located on the Splash?
It’s housed near the engine where the radiator hose meets the engine block/head. On the K12B petrol, it’s integrated in a housing at the end of a main coolant outlet. Access typically requires removing the intake ducting and hose, then unbolting the housing to swap the unit and seal.