Parts for your 2013 Toyota Vitz|yaris-Thermostat

2013 Toyota Vitz/Yaris Thermostat — What It Does and When to Replace It

Based on Toyota’s Repair Manual (TIS) for the 2013 Vitz/Yaris (KSP130/NCP13# cooling system sections), the Toyota Electronic Parts Catalogue (thermostat/water inlet listings for 1KR‑FE and 1NR‑FE engines), and well-known workshop guides such as the Haynes Yaris manual for this generation, the 2013 Toyota Vitz/Yaris is definitely fitted with a wax‑pellet style engine thermostat. It sits in the water inlet housing where the lower radiator hose meets the engine block.

The thermostat’s job is simple but critical. When the engine is cold, it stays shut to help the motor warm up quickly. Once it reaches operating temp, it opens to let coolant circulate through the radiator, keeping temps steady. That quick warm-up protects the engine, trims fuel use, improves heater performance, and reduces emissions. If it sticks open, the car runs cool and thirsty, if it sticks closed, it can overheat and cause expensive damage. So yes, it matters.

For a 2013 Vitz/Yaris in Aussie or Kiwi conditions, the thermostat isn’t a “replace by date” item, but it’s smart to assess it any time the cooling system is serviced. Ten-plus years on, many owners opt to replace it preventatively when doing coolant, water pump, or hose work—especially if there are hints of slow warm-up or temp fluctuations.

• Common signs it’s on the way out: slow heater warm-up, gauge sitting low on the open road, higher fuel use, rough running on cold mornings, or overheating under load.
• Location: under the bonnet at the water inlet housing on the block (follow the lower radiator hose).

Service tips for this model: use the correct temperature-rated thermostat matched to the engine code (1KR‑FE 1.0L or 1NR‑FE 1.3L) and stick with a genuine or reputable brand. Always fit a new O‑ring/gasket, clean the mating surfaces, and torque the housing bolts to factory spec. Refill with Toyota Super Long Life Coolant (pink), bleed air carefully (use the heater on hot), and verify operation with a stable gauge reading and warm cabin air on a test drive. Removing a thermostat “to run cooler” isn’t on—it’ll mess with fuelling and can cause long-term wear. A tidy, leak‑free install and fresh coolant will keep the little Toyota happy for many more kilometres.

Popular questions about the 2013 Toyota Vitz/Yaris thermostat

Does a 2013 Vitz/Yaris actually have a thermostat?
Yes. Toyota’s service literature and parts catalogue list a wax‑pellet thermostat for the KSP130/NCP13# models. It lives in the water inlet housing at the block, where the lower radiator hose connects.

What thermostat temperature should be used?
Use the factory‑specified thermostat for your engine code (1KR‑FE or 1NR‑FE). Most petrol variants in this range open in the low‑80s °C, but the exact rating varies by engine and market. Match it to the VIN/engine in the Toyota EPC or a trusted parts supplier.

When should it be replaced?
There’s no strict interval, but after a decade it’s sensible to replace it when doing coolant service or if there are symptoms like slow warm-up, fluctuating temps, poor heater output, or any overheating episode. Always renew the seal and bleed the cooling system properly.