Parts for your 2019 Suzuki Splash-Radiator cap

Does a 2019 Suzuki Splash actually have a radiator cap?

Short answer: no, not a traditional radiator-neck cap. The Splash uses a sealed, pressurised coolant system where the pressure cap lives on the expansion/degassing tank, not on the radiator itself. This layout is documented in Suzuki’s own technical literature for the Splash/Ritz (K12B/K12M engines) under Cooling System, which specifies filling via the reserve tank and lists the cap’s pressure rating (about 108 kPa/1.1 bar). Suzuki parts catalogues for the Splash show a radiator without a filler neck and a separate pressure cap on the expansion bottle, and the owner’s manual tells drivers to check and top up coolant at the reservoir rather than at the radiator. For vehicles first registered around 2019 (late imports/registrations), the platform and cooling setup are the same, so a “radiator-cap” isn’t a thing on this model.

Why Suzuki went this way is pretty straightforward. A pressurised expansion tank mounted at the system’s high point helps purge air, stabilises coolant level, and keeps the radiator tucked low without a separate filler neck. Fewer joints up front also reduce leak points, and day-to-day servicing becomes simpler because owners only open the reservoir cap when the engine’s stone-cold.

So if someone’s hunting a “2019 Suzuki Splash radiator cap,” what they actually need is the expansion tank pressure cap. It does the same job—holds pressure to raise the coolant’s boiling point and meters vacuum on cool-down—but it sits on the plastic bottle at the side of the bay. Typical specs are around 1.1 bar, always match what’s printed on the original cap or in Suzuki service data for that VIN.

• When to look at it: during routine servicing or any time there’s unexplained coolant loss, stains around the bottle, hoses collapsing as the engine cools, or overheating at highway speeds.
• How to treat it: only open when completely cold, crack it slowly to release any residual pressure. Inspect the rubber seals and the spring. Replace if the seal’s perished, the spring’s weak, or pressure-test results are off.
• Coolant: stick with the Suzuki-specified long-life coolant for the Splash and mix as directed. If unsure, check the service manual or cap label.

Popular questions about a 2019 Suzuki Splash radiator cap

Where is the radiator cap on a 2019 Suzuki Splash?
There isn’t one on the radiator. The pressure cap is fitted to the expansion/degassing tank on the left or right side of the engine bay (location can vary slightly by market). That cap is the one to inspect, pressure-test, or replace.

What pressure rating cap does the Splash use?
Most K12B Splash variants use a cap around 1.1 bar (108 kPa). Always confirm the exact rating printed on your existing cap or in Suzuki service data for your VIN to avoid under- or over-pressurising the system.

What are the signs the cap needs replacing?
Coolant weeping or crusty residue around the bottle neck, hoses that collapse after cool-down, frequent top-ups, gurgling in the heater, or temperature fluctuation at speed. A cooling system pressure/vacuum test during service is the best way to verify cap health.