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, if it sticks open, warm‑up is sluggish and the temp gauge can hover low on the motorway.

For routine servicing, most workshops treat the thermostat as a replace‑on‑condition item. Still, on an older YRV it’s smart preventative maintenance to refresh it every 8–10 years or around 120–150,000 kilometres, or any time the cooling system is being overhauled. Always fit a quality thermostat with the correct temperature rating and a new O‑ring or gasket, and follow workshop torque specs for the housing bolts.

• Common clues it’s due: overheating under load, slow cabin heat, temp swings at cruise, brown crust or seepage at the housing, and the fan cycling oddly.
• Best practice when replacing: clean mating faces, position the jiggle pin at 12 o’clock (if present), and use proper coolant.

Under the bonnet, access is typically at the engine side of the lower radiator hose. Catch and dispose of old coolant responsibly, remove the housing, swap the thermostat and seal, then refill with the correct 50/50 long‑life coolant (the red Toyota/Daihatsu‑type is commonly specified). Bleed the system with the heater on hot, squeeze the hoses to purge air, idle until the thermostat opens, top up, cap it, and recheck the level after a short drive. Turbo K3‑VET models may be a tighter fit, but the process is much the same — use quality clamps and hoses rated for boost‑related temps.

Done right, a fresh thermostat helps the 2001 YRV run at its proper operating temperature, improving reliability and keeping it comfy across New Zealand and Australian conditions.

Popular questions about the 2001 Daihatsu YRV thermostat

What temperature rating should the YRV’s thermostat be?
Technical data for the YRV’s K‑series engines lists a thermostat that begins opening in the mid‑80s °C range and is fully open a few degrees higher. Always match the rating to the engine code on the vehicle and what the workshop manual or reputable parts catalogues specify for that VIN.

Where is the thermostat located on a 2001 YRV?
It’s mounted in the water inlet housing on the engine block, usually where the lower radiator hose connects near the front of the engine. The housing is held with a couple of bolts, access is from above with the airbox out of the way on some cars, or from underneath on ramps.

Do you need to bleed the system after replacing the thermostat?
Yes — the thermostat itself doesn’t “need” bleeding, but the cooling system does. Fill with the correct coolant mix, set the heater to hot, run the engine to operating temperature with the radiator cap off until the thermostat opens, squeeze the hoses to purge air, top up, fit the cap, then confirm the overflow level and recheck after a day’s driving.