Parts for your 2017 Suzuki Splash-Radiator cap

2017 Suzuki Splash radiator cap: is there one?

Based on technical sources, the 2017 Suzuki Splash does not have a traditional radiator cap on the radiator. The Splash uses a sealed, pressurised cooling system with the pressure cap fitted to the coolant expansion (reservoir) tank instead. So there’s no cap to open on the radiator neck under the bonnet.

Technical references that confirm this layout include:

• Suzuki Splash Owner’s Manual (2017): cooling checks and topping-up are done at the translucent coolant reservoir, a radiator cap is neither shown nor serviced.
• Suzuki workshop/service manual for Splash/Agila (K10B/K12B engines): cooling diagrams show a pressurised expansion tank with a pressure-relief cap and a radiator without a filler neck.
• Manufacturer parts catalogues for the Splash/Opel Agila B: list a “cap, coolant reservoir” and no separate “radiator cap”.

Why isn’t there a radiator cap? In modern compact cars like the Splash, the radiator sits low and forward. A high-mounted expansion tank with a pressure cap improves self-bleeding, keeps a constant head of coolant, and adds safety by keeping hot, pressurised coolant away from the front of the radiator. It also helps packaging and crash performance. Functionally, the reservoir cap does the same job an old-school radiator cap did: it holds system pressure to raise the coolant’s boiling point and then vents safely if pressure gets excessive.

Chasing a “radiator cap” for a 2017 Splash? What’s actually needed is the coolant reservoir pressure cap. Under the bonnet, it’s on the plastic coolant bottle (often on the passenger-side inner guard). Only open it when the engine is completely cold. If the cap’s rubber seal is perished, the spring feels weak, there’s dried coolant around the neck, or the car runs hot and pushes coolant into the bottle, the cap may be due for replacement. Fit an OEM-spec, correct-pressure cap — guessing the pressure rating can cause chronic overheating or coolant loss. As part of regular servicing in Australia and New Zealand, it’s smart to have the cooling system and cap pressure-tested, hoses inspected, and coolant strength checked about every 2 years or 40,000 km. Use the correct Suzuki-approved coolant and top up with the right pre-mix to maintain corrosion protection and temperature control.

• Signs a Splash reservoir cap may be failing:
  • Coolant smell or white crust around the reservoir neck
  • Coolant level rising and spilling after drives
  • Overheating at low speeds but fine on the highway

FAQs

Where is the radiator cap on a 2017 Suzuki Splash?
There isn’t a cap on the radiator. The only pressure cap is on the coolant expansion tank. Look for the black plastic cap on the translucent bottle under the bonnet, usually near the passenger-side inner guard. Always open it only when the engine is cold to avoid scalding.

What pressure cap does the 2017 Splash use?
Use a cap that matches the factory specification for the Splash. The rating is printed on the cap and listed in the owner’s manual and service information. Using a cap with the wrong pressure rating can cause boiling, coolant loss, or extra stress on hoses and the heater core.

Can a faulty reservoir cap cause overheating?
Yes. If the cap can’t hold pressure, the coolant’s boiling point drops and the system may vent fluid, leading to overheating — especially in slow traffic or hot weather. If overheating is paired with coolant smells or stains near the reservoir, have the cap and system pressure-tested.