Parts for your 2022 Suzuki Splash-Radiator cap

2022 Suzuki Splash radiator-cap: is there one, and what should owners know?

Short answer: a traditional radiator cap on the radiator itself isn’t used on the Suzuki Splash. The Splash shares its cooling layout with the Opel/Vauxhall Agila B and Suzuki K‑series small cars, which run a sealed radiator and a remote, pressurised expansion (degas) tank. The pressure cap lives on that plastic reservoir, not on the radiator. So for any Splash first registered in 2022—typically late registrations of the existing model—the relevant “cap” is the coolant reservoir pressure cap, not a radiator-neck cap.

Why Suzuki went this way comes down to packaging, safety, and reliability. A sealed radiator with a remote pressure cap makes filling and level checks simple at the translucent tank under the bonnet, keeps hot pressurised coolant away from the front crossmember, and helps purge air automatically as the engine warms and cools. The cap on the expansion tank regulates system pressure just like an old-school radiator cap would—it’s just moved off the radiator to the bottle. If you’re chasing a “radiator-cap” for a 2022 Splash, what you actually want is the correct-spec coolant reservoir pressure cap.

Good maintenance focuses on that reservoir cap and the coolant itself:

• Inspect the reservoir cap seal for cracks, hardening, or coolant crust. Replace the cap if the seal’s tired or if you’re getting random overheating, weak cabin heat, or hoses that collapse on cool-down—classic signs of a cap that won’t hold vacuum/pressure.
• Use an OE or OE-equivalent cap with the correct pressure rating as printed on the original cap or listed in the service data. Mismatched pressure can cause leaks or premature hose/radiator wear.
• Only open the cap when the engine is stone cold. Top up with the specified coolant and bleed per the workshop procedure after any drain or hose replacement.
• If diagnosing leaks, a cooling-system pressure tester with the right adapter for the reservoir neck lets a tech confirm whether the cap holds pressure.

Technical sources that describe this sealed-radiator, pressurised expansion-tank setup for the Splash/Agila platform include:

• Suzuki Splash Owner’s Manual (Cooling System section): fill/check at the coolant reservoir, warnings on opening the reservoir cap when hot.
• Suzuki Ritz/Splash (K12B) Service Manual, Cooling System section: diagrams show the radiator without a filler neck and the pressure cap on the expansion tank.
• Opel/Vauxhall Agila B Workshop Manual (Cooling System): sealed radiator design with a remote pressurised degas bottle.

Does the 2022 Suzuki Splash have a radiator cap?

No. It uses a sealed radiator and a remote, pressurised expansion tank. The pressure cap you service and replace is on the coolant reservoir.

Which cap should be replaced on a Splash if there are cooling issues?

Replace the coolant reservoir pressure cap with an OE-spec unit of the correct pressure rating. It performs the same job as a traditional radiator cap in this design.

Where do you top up coolant on a Splash?

Under the bonnet at the translucent expansion tank. Only open the cap when the engine is cold and use the specified coolant, then bleed the system as per the workshop procedure after major work.