Parts for your 2001 Daihatsu Yrv-Thermostat

2001 Daihatsu YRV thermostat — fitment, purpose, and service tips

A thermostat is absolutely fitted to the 2001 Daihatsu YRV. Technical sources including the Daihatsu YRV M200-series workshop manual (Cooling System section), the Daihatsu Electronic Parts Catalogue, and common service data/catalgoues from Autodata, Dayco and Gates all list a wax‑pellet engine coolant thermostat for the YRV’s engines (K3‑VE, K3‑VET and market‑specific EJ‑VE). It sits in the engine’s water inlet housing, where the lower radiator hose joins the block, and is calibrated to open in the mid‑80s °C range to regulate coolant flow.

The thermostat’s job is simple but crucial. When the YRV is started from cold, it stays closed so the engine warms up quickly — better fuel economy, a happier heater, and reduced emissions. Once it’s up to temperature, the thermostat opens, letting coolant circulate through the radiator to hold that sweet spot under load. If it sticks shut, the engine overheats