Parts for your 2020 Suzuki Splash-Thermostat

2020 Suzuki Splash thermostat — what it does and when to replace it

Referencing Suzuki’s technical sources, a thermostat is absolutely relevant and fitted to the 2020 Suzuki Splash. The Suzuki K‑series engine service manuals (K10B/K12B), the Suzuki Electronic Parts Catalogue for Splash/Ritz, and Maruti Ritz workshop literature all list a wax‑pellet engine thermostat in the cooling circuit. It sits in a housing on the engine side of the lower radiator hose and regulates coolant flow based on temperature.

For the 2020 Suzuki Splash, the thermostat’s job is simple but vital: it helps the engine warm up quickly, then keeps it right in the sweet spot once it’s hot. By holding coolant back when the engine is cold, it speeds warm‑up, which means better fuel economy, lower wear, and quicker cabin heat on chilly mornings. Once it reaches operating temp (typically mid‑to‑high 80s °C depending on engine spec), it opens and lets coolant circulate through the radiator to stop overheating. Without a healthy thermostat, the Splash can run too cool (sluggish, thirsty, weak heater) or too hot (risking head gasket damage).

There’s no strict kilometre-based replacement interval for the thermostat, but it’s smart preventative maintenance. On a 2020 Splash, many workshops in Australia and New Zealand will check thermostat operation whenever coolant is serviced (about every 4–5 years, or per the owner’s book). If the vehicle has crossed 100,000–150,000 km, or sees harsh stop‑start or coastal conditions, pre‑emptive replacement with a quality OEM‑equivalent unit is a fair call.

• Common clues it’s due: slow warm‑up, erratic temp gauge, weak heater, high fuel use, overheating in traffic, or stored ECT/thermostat efficiency faults.
• Best practice at replacement: fit a new O‑ring/gasket, refresh coolant with the correct ethylene‑glycol, silicate‑free formula mixed with demineralised water, and properly bleed air from the system.
• Location and access: the Splash thermostat is housed where the lower radiator hose meets the engine. Access typically improves with the airbox and related bits out of the way.
• Post‑service checks: confirm hose temps with the engine at operating heat, verify fan cut‑in, and scan live coolant temperature to ensure stable control.

Doing the thermostat as part of a broader cooling service pays off. Pair it with fresh coolant, a pressure test, a cap check, and a look at the water pump and hoses, and the little Suzuki stays happy on city runs and long Kiwi or Aussie highway stints alike.

Popular questions about the 2020 Suzuki Splash thermostat

What temperature rating should the Splash thermostat be?

Most K‑series Suzuki engines use a thermostat that begins opening in the mid‑to‑high 80s °C. The exact value is stamped on the thermostat itself. For replacements, match the OE spec listed for the K10B or K12B engine to keep warm‑up and cooling behaviour spot on.

Where is the thermostat located on a 2020 Splash?

It’s in the thermostat housing where the lower radiator hose meets the engine. On the Splash, access is from the front of the bay, removing the intake snorkel/airbox usually makes room to reach the housing, hose clamp, and bolts comfortably.

Does the thermostat need routine replacement, or only if it fails?

There’s no fixed interval, but replacing it preventatively around major coolant services or past 100,000 km is common sense. If there are symptoms like slow warm‑up, unstable temp readings, or overheating, test it and replace as needed with a new seal and fresh coolant.