Parts for your 2002 Daihatsu Gran move-Thermostat

2002 Daihatsu Gran Move Thermostat — What it does and how to look after it

Yes, the 2002 Daihatsu Gran Move absolutely uses a thermostat in its cooling system. Technical references including the Daihatsu Gran Move/Pyzar G30# workshop manual (1996–2002), the Daihatsu Electronic Parts Catalogue (G303/G313 series), and Autodata service specs for the HD-E/HE-E family engines all list a thermostat assembly located at the engine-side coolant housing (typically where the lower radiator hose meets the block). The common spec is an 82–88°C thermostat, stamped with its opening temperature.

On this Gran Move, the thermostat’s whole job is to get the engine up to the right operating temperature quickly, then keep it steady. That steadiness helps fuel economy, cuts engine wear, keeps emissions tidy, and makes the cabin heater work properly. If it sticks shut, the engine can overheat, if it sticks open, the engine can run too cool, burn more fuel, and feel a bit flat.

As part of servicing an older Gran Move, it’s smart to treat the thermostat as a small, high-impact item. If it’s original or unknown, replacing it when doing a coolant change offers cheap insurance. Use the correct temp rating (usually 82°C in Australia and NZ), fit a new gasket or O-ring, and refill with the right ethylene glycol long-life coolant (don’t mix types or colours). Always start with a cold engine and catch old coolant for proper disposal.

• Typical symptoms of a crook thermostat:
  • Overheating or sudden temp spikes
  • Gauge stuck low, lukewarm heater, poor fuel economy
  • Temperature hunting up and down on the move

• Handy replacement tips:
  • Locate the alloy housing at the engine end of the lower radiator hose
  • Clean mating faces, lightly torque housing bolts (check workshop spec, around 10 Nm is common)
  • Refill slowly, set the heater to HOT, bleed air, and recheck the level after the first drive
  • Inspect hoses and the radiator cap, age-related parts are cheap to refresh together

With a fresh thermostat and healthy coolant, the Gran Move warms up promptly, holds its temp rock-solid, and stays happier on hot Aussie and Kiwi summer days and chilly winter mornings alike.

What temperature thermostat should a 2002 Gran Move run?

Most use an 82°C thermostat, with some markets listing 88°C for colder climates. The correct rating is stamped on the flange of the new part and referenced in the Daihatsu workshop data. Full opening typically occurs by the mid-90s °C.

Where is the thermostat on the Gran Move?

It’s in the alloy housing at the engine end of the lower radiator hose. Two or three bolts hold the cover, behind it sits the thermostat and a rubber O-ring or paper gasket. Have a drip tray ready, as coolant will spill when the housing is opened.

Does it need bleeding after replacement?

Yes. Refill slowly, set the heater to HOT, run the engine at fast idle, and squeeze the upper hose to purge air. Top up the radiator and overflow bottle, then recheck the level and for leaks after the first proper heat cycle.