Parts for your 2009 Suzuki Splash-Thermostat

2009 Suzuki Splash Thermostat — Fitment, Purpose and Service Tips

Based on technical sources including the Suzuki factory service manual for K10B/K12B engines (Cooling System), the Suzuki Electronic Parts Catalogue (EPC), and established aftermarket catalogues from Tridon and Gates, the 2009 Suzuki Splash is fitted with a conventional wax‑pellet engine thermostat. The related Vauxhall/Opel Agila B service literature—given the shared platform—also confirms a thermostatically controlled cooling circuit on these engines, including the 1.3 DDiS diesel where fitted.

On this model, the thermostat regulates coolant flow to help the engine reach and hold its designed operating temperature—typically in the 82–88°C range, depending on engine variant and market calibration. It keeps the Splash warming up briskly for better fuel economy and emissions, stabilises temperature under load or on a hot Kiwi or Aussie summer day, and keeps cabin heat consistent in winter. Maintaining the right temp protects head gaskets, prevents hot spots, and reduces sludge and varnish formation.

The unit sits in a housing at the engine end of the upper radiator hose, using a wax element that expands with heat to open a valve. Most variants use a replaceable thermostat and O‑ring, some housings vary by engine code, so matching by VIN is sensible. There’s no strict kilometre interval for the thermostat, but as coolant ages or if overheating or slow warm‑up appears, inspection or replacement during scheduled cooling‑system service is smart.

• Likely fault clues: long warm‑up, wavering temp gauge, weak heater, or overheating under load.
• Always renew the O‑ring/gasket, clean mating faces, and use the correct Suzuki‑spec ethylene‑glycol coolant premix.
• After refilling, bleed air thoroughly to avoid hot spots and erratic temps.

1. Let the engine cool fully and relieve pressure under the bonnet.
2. Drain enough coolant to drop below the thermostat level.
3. Remove intake ducting/airbox if it blocks access, undo the housing evenly.
4. Note the thermostat’s orientation, if a jiggle pin exists, keep it at the top.
5. Install the new unit with a fresh seal, tighten housing bolts evenly to factory spec.
6. Refill with the correct premix, run the heater on HOT, bleed air, and check for leaks and stable temperature on a test drive.

Owners in harsher climates or doing high‑kilometre motorway runs may opt to replace the thermostat preventively around the 8–10 year or 150–200,000 km mark when doing hoses and coolant. Dispose of old coolant responsibly—don’t tip it down the drain.

Popular questions about the 2009 Suzuki Splash thermostat

What temperature thermostat does the 2009 Suzuki Splash use?

The Splash typically runs a thermostat that begins opening around 82–88°C, depending on whether it’s the K10B/K12B petrol or the 1.3 DDiS diesel and local market spec. Matching the original temperature rating listed in the parts catalogue or service data is best for everyday road use.

Where is the thermostat located on a 2009 Suzuki Splash?

It’s housed at the engine end of the upper radiator hose, near the cylinder head under the bonnet. On many cars it’s part of, or bolted to, a plastic or alloy outlet housing that becomes accessible once the intake duct or airbox is moved aside.

Does the thermostat need routine replacement?

There’s no strict time‑based replacement, but replacing it when symptoms appear—or preventively during a major cooling system service at around 8–10 years/160,000 km—is common practice. Always fit a new O‑ring/gasket and use the correct coolant, then bleed air carefully.