Parts for your 2023 Suzuki Splash-Thermostat

Does the 2023 Suzuki Splash use a thermostat?

Short answer: yes, the Splash platform uses a conventional engine coolant thermostat. But there’s an important footnote. Factory model guides and service information list the Suzuki Splash (RB/A5 platform) as being produced up to the mid‑2010s, not as a 2023 model. That’s backed by Suzuki service manuals for the K10B/K12B petrol engines and the 1.3 DDiS diesel, plus dealer EPC/parts catalogues and independent workshop data. If someone’s calling their car a “2023 Suzuki Splash”, it’s most likely a late registration, private import, or a paperwork quirk — and it still runs a thermostat just like every other Splash.

The thermostat’s job on a Splash is to help the engine reach and hold its sweet‑spot temperature quickly. It stays closed during warm‑up to circulate coolant within the engine, then opens around the specified temperature (typically high‑80s to low‑90s °C for K‑series petrol) to send coolant through the radiator. That steady temp means better fuel economy, lower emissions, reliable cabin heat, and less engine wear — exactly what the Suzuki technical literature describes for these engines.

As part of routine servicing, it’s smart to treat the thermostat as a cooling‑system “gatekeeper”. If the gauge hunts around, the heater’s lukewarm on the open road, the engine overheats in traffic, or there’s a P0128 code, a lazy or stuck thermostat could be the culprit. On any Splash, replacing the thermostat is straightforward for a trained tech: cool the engine, drain enough coolant, pop the housing at the engine end of the lower radiator hose, swap the unit and O‑ring, clean the mating faces, refit to workshop torque, refill with the correct premix coolant, and bleed the system with the heater on hot. Using an OEM‑spec thermostat (correct jiggle‑valve orientation) and a fresh seal is non‑negotiable.

Maintenance‑wise, keep to coolant change intervals, check hose condition, and watch for leaks at the housing after any service. There’s no fixed “use‑by date” for the thermostat, but many techs in Australia and New Zealand will proactively replace it during major cooling‑system work or around the eight‑to‑ten‑year/150,000‑plus‑kilometre mark, especially if the history’s unknown. It’s a low‑cost part that protects a high‑cost engine, and it’s well worth doing right under the bonnet.

• Common signs it’s time: slow warm‑up, overheating, fluctuating temp gauge, poor heater performance, P0128, or visible leaks at the housing.
• Good practice: new O‑ring every time, correct coolant type, proper bleeding, and follow the Splash workshop spec for fasteners.

Popular questions about the 2023 Suzuki Splash thermostat

Where is the thermostat on a Suzuki Splash?
The thermostat sits at the engine end of the lower radiator hose. On K12B 1.2‑litre petrol models it’s mounted on the front of the engine in the thermostat housing near the water pump, K10B 1.0‑litre is similar. The 1.3 DDiS diesel places it by the pump housing on the transmission side. Access is under the bonnet from above, some models benefit from removing the airbox for room.

What are the symptoms of a faulty thermostat?
Typical clues are overheating in traffic, very slow warm‑up, a heater that goes cold at highway speeds, a temp gauge that swings up and down, or a check‑engine light with P0128 (coolant temp below regulating threshold). You might also see coolant weeping at the housing if the seal’s had it. Any of these warrant inspection before bigger problems develop.

How often should the thermostat be replaced?
There’s no strict interval in the Splash service data. Replace on symptoms or when tackling major cooling‑system work. As a preventative move in AU/NZ conditions, many workshops aim for around 8–10 years or 150,000–200,000 kilometres, especially if the service history is patchy. Always fit a quality, OEM‑spec unit and a new O‑ring, then bleed the cooling system properly.