Parts for your 2024 Suzuki Splash-Radiator cap

2024 Suzuki Splash radiator cap — is it fitted?

Short answer: a traditional radiator cap on the radiator itself isn’t used on the 2024 Suzuki Splash. Suzuki engineered the Splash (K10B/K12B engines) with a sealed cooling system that places the pressure cap on the plastic expansion/surge tank, not on the radiator neck.

This isn’t guesswork. Suzuki’s factory service information for the Splash cooling system (K10B/K12B) specifies the pressure cap on the expansion tank, and the owner’s handbook shows only the coolant reservoir as the service fill point. The Opel/Vauxhall Agila B (the Splash’s sister model) is documented in Opel TIS the same way, with a surge tank cap rather than a radiator cap. Major aftermarket catalogues (Gates, Dayco, Motorad) also list a reservoir/expansion tank cap for Splash/Agila and do not list a separate radiator-neck cap. Put together, those technical references confirm there’s no conventional radiator cap on this vehicle.

Why the change? Modern compact cars like the Splash move the pressure cap to the expansion tank for a few good reasons:

• Better packaging and fewer leak points — no filler neck on the radiator.
• Improved deaeration — air purges to the highest point (the tank).
• Consistent pressure control — the cap maintains system pressure (typically around 1.1 bar, check the marking on the cap) from one accessible location.
• Safety — the hot, high-pressure opening is away from the radiator core and fans.

So, when parts sites say “radiator cap” for a 2024 Suzuki Splash, they’re actually talking about the expansion tank pressure cap. That cap still does the classic job: it raises the coolant’s boiling point by holding pressure and allows excess pressure to vent, then draws coolant back as the system cools.

Care tips for the Splash’s coolant cap are straightforward. Inspect the rubber seal for cracks or flattening, make sure the spring feels positive, and replace the cap if there’s any sweet coolant odour, staining near the tank, or if a cooling-system pressure test shows the cap won’t hold the specified pressure. Use the marked pressure rating on the cap or the spec in the owner’s manual, and don’t open it when hot. In Aussie and Kiwi conditions, many workshops will proactively replace the cap around 80–100,000 km or 5–7 years, or sooner if cooling performance isn’t up to scratch.

Popular questions

Where is the radiator cap on a 2024 Suzuki Splash?

There isn’t a cap on the radiator itself. The Splash uses a pressurised expansion (surge) tank mounted in the engine bay. The black plastic cap on that tank is the system’s pressure cap and the only place you should open to top up coolant (when the engine is cold).

What pressure cap does the Splash use?

Most Splash/Agila B models use a cap around 1.1 bar (about 110 kPa), but always check the marking on your current cap or the specification in the owner’s handbook/workshop manual. Using the wrong pressure rating can cause overheating or premature hose and radiator wear.

When should the Splash coolant cap be replaced?

Replace it if the seal is cracked, the spring feels weak, there’s visible coolant staining or smell near the tank, or if a pressure test shows it won’t hold spec. As preventative maintenance in Australian and New Zealand conditions, many techs swap the cap every 80–100,000 km or 5–7 years, especially if doing coolant service at the same time.