Parts for your 1997 Daihatsu Gran move-Radiator hose

1997 Daihatsu Gran Move radiator hose: purpose, care and when to replace

For the 1997 Daihatsu Gran Move (also known as the Pyzar, G300-series), a radiator hose is absolutely used and relevant. Factory documentation and industry catalogues list both upper and lower radiator hoses as service parts for this model. References include the Daihatsu Gran Move/Pyzar G300-series Workshop Manual (Cooling System section, 1996–1999), the Daihatsu Electronic Parts Catalogue (Group 16 – Cooling), and Australian application guides from Gates and Dayco, all of which identify moulded upper and lower radiator hoses for the Gran Move.

On this vehicle, the radiator hoses do the unglamorous but critical job of carrying coolant between the engine and the radiator. As the thermostat opens, hot coolant travels via the upper hose to the radiator to shed heat, then returns cooler through the lower hose. Healthy hoses keep pressures stable, temperatures in check, and the cabin heater happy. Because they’re constantly dealing with heat cycles, pressure, and a whiff of oil vapour under the bonnet, hoses naturally age, harden, soften, or crack over time.

For a Gran Move that’s still doing the rounds in Australia or New Zealand, a sensible service approach is to inspect hoses at each service and replace them roughly every 4–6 years or 80,000–100,000 km, whichever comes first, or sooner if there are signs of wear. Always use quality EPDM moulded hoses that match the original shape, and fit new clamps at the same time. When replacing, drain the coolant, swap the hoses, refill with the correct coolant type as specified in the Daihatsu manual, and bleed the system with the heater on hot to purge air. After a few heat cycles, recheck clamp tension and coolant level.

• Look for tell-tales: swelling near ends, surface cracks, soft spots, oil contamination, or a hose that feels spongy or rock-hard.
• Don’t mix coolant types, stick with the spec and change coolant at the recommended interval to protect the hose compound.
• If a hose has failed, inspect the radiator necks, thermostat, and cap pressure to avoid repeat dramas.

Using the right hoses and staying on top of maintenance keeps the Gran Move’s cooling system reliable, especially during long summer drives or slow, stop–start commuting.

Popular questions

What size radiator hoses fit a 1997 Daihatsu Gran Move?
They’re moulded application-specific pieces rather than straight lengths, so exact sizes vary by engine code and build date. The upper and lower hoses should be selected by VIN or model code using a trusted parts catalogue (e.g., Daihatsu EPC, Gates, Dayco) to ensure the correct shapes and diameters seal properly on the radiator and thermostat housing.

How often should the radiator hoses be replaced?
Plan on 4–6 years or 80,000–100,000 km under normal use, with annual inspections. Replace immediately if you find cracks, bulges, soft spots, oil swelling, persistent coolant smell, or dried coolant traces near the hose ends or clamps.

Can a universal flex hose be used on a Gran Move?
It can get you out of trouble roadside, but for long-term reliability it’s best to fit the correct moulded hose. The proper shape prevents kinks, maintains flow, and reduces stress on radiator necks and fittings.