Parts for your 2017 Suzuki Splash-Thermostat housing

2017 Suzuki Splash thermostat-housing: what it does and how to look after it

Yes, the 2017 Suzuki Splash does use a thermostat-housing. Factory documentation for the Splash and its twin (Opel/Vauxhall Agila B) identifies a dedicated thermostat-housing on both the K12B/K10B petrol engines and the D13A 1.3 DDiS diesel. This is shown in Suzuki’s engine service manuals for the K-series engines, the Suzuki Electronic Parts Catalogue, and Fiat/GM technical material covering the 1.3 Multijet/DDiS cooling circuit. Those sources describe an integrated housing that carries the thermostat, coolant outlet, and often a temperature sensor.

The thermostat-housing on a Splash keeps the engine sitting right in its sweet spot for temperature. It holds the thermostat, directs coolant flow, and provides the main outlet to the radiator. By keeping warm-up quick and steady, it helps fuel economy, emissions, engine longevity, and heater performance on a chilly morning.

Because most Splash variants use an integrated assembly, the housing is typically a composite (plastic) unit with an O-ring seal and a hose neck for the upper radiator hose. Plastic is light and resists corrosion, but after years of Aussie or Kiwi heat cycles it can go brittle or warp. That’s why technicians treat the housing as a wear item to inspect during scheduled cooling-system services.

Practical servicing tips for a 2017 Splash thermostat-housing:

• Inspect at every coolant change or annually: look for pink/green/blue crust, hairline cracks, or weeping around the seam, sensor boss, or hose stub.
• Watch for symptoms: slow warm-up, fluctuating gauge, heater underperforming, rising temps in traffic, low coolant, or the sweet smell of coolant under the bonnet.
• If there’s any doubt, replace the entire assembly (thermostat, housing, and O-ring). It’s often more reliable than swapping just the thermostat.
• Use the correct long-life OAT coolant that meets Suzuki specifications (often branded as Suzuki Super Long Life Coolant). Mix and fill per the manual and bleed air thoroughly with the heater set to hot.
• Tighten mounting bolts to the workshop manual torque spec. Over-tightening can crack a plastic housing or distort the seal.
• Consider new hose clamps and, if fitted, a new temp sensor O-ring while you’re in there.

Replacement is a straightforward bolt-off/bolt-on job for a competent DIYer, but space can be tight and bleeding the system properly matters. If unsure, a trusted workshop can sort it quickly. And don’t tip old coolant down the drain—dispose of it responsibly, it’s toxic to pets and wildlife.

Popular questions about the 2017 Suzuki Splash thermostat-housing

Where is the thermostat-housing on a 2017 Splash?
On K12B/K10B petrol models, it’s mounted on the cylinder head at the radiator upper-hose connection, near the timing chain end. On the 1.3 DDiS diesel, it’s on the block with the main outlet and a sensor port—follow the upper radiator hose to find it.

Should the whole housing be replaced or just the thermostat?
Most Splash setups use an integrated assembly. Replacing the complete housing, thermostat, and seal is the reliable route, reducing the chance of leaks or mismatched parts—especially on high-kilometre cars or if the original plastic has aged.

What else should be done during replacement?
Fit a new O-ring, use the correct long-life coolant, bleed air thoroughly, and check hose clamps. If access is tight, a workshop can handle it with the proper torque settings and bleed procedure from the factory manual.