Parts for your 1998 Daihatsu Gran move-Radiator hose

1998 Daihatsu Gran Move radiator hose: what it does and how to look after it

Yes, a radiator hose is absolutely used on the 1998 Daihatsu Gran Move. Technical references including the Daihatsu Gran Move/Pyzar Workshop Manual (Cooling System, 1997–2002), the Daihatsu Electronic Parts Catalogue for G301/G303 models, and general service manuals covering the HC-EJ and HD-EP engines all show an upper and a lower radiator hose routing coolant between the engine and radiator. So the part is relevant and essential on this vehicle.

On a ’98 Gran Move, the radiator hose pair does a simple but vital job: carry hot coolant from the engine to the radiator and return cooled fluid back again. Without healthy hoses, the cooling system can’t hold pressure, temperatures climb, and under-bonnet carnage can follow. For owners who want their Gran Move to stay happy on school runs and weekend missions, keeping your 1998 Daihatsu Gran Move radiator hose in top nick is a smart move.

As part of routine servicing, it pays to give the hoses a squeeze and a close look. They should feel firm but pliable, not rock-hard or mushy. Any swelling near the clamps, cracking, glazing, oil contamination, or weeping at the connections is a red flag.

• Replace hoses every 4–6 years or 80,000–100,000 km, whichever comes first.
• Inspect at every service (around 10,000–15,000 km) and any time the bonnet’s up for coolant work.
• Renew spring clamps if they’ve lost tension, quality worm-drive clamps are fine if correctly sized and tightened.

When fitting new hoses, match them to the exact engine (1.5 HC-EJ or 1.6 HD-EP) and chassis code (G301/G303). Correct internal diameter and the molded shape matter, universal flex hose is a last resort. Lightly lube the inside with a smear of coolant, seat the hose fully past the bead, and orient the clamps so you can recheck tension easily. After bleeding the system, run the engine to operating temp and top up the radiator and overflow as needed.

Coolant quality affects hose life. Use the specified ethylene glycol coolant at the proper mix (commonly 50/50) and change it on schedule, old, acidic coolant eats hoses from the inside out. If a hose has failed, assume the rest are the same age—doing the upper, lower, and heater hoses together saves hassles down the track.

Bottom line: fresh coolant, sound clamps, and quality molded hoses will keep this little Daihatsu cool and cruising without drama.

Popular questions

What size radiator hose does a 1998 Gran Move use?
The exact internal diameter varies slightly by engine and radiator supplier. Upper hoses are typically around the low-30 mm ID range and lowers in the high-20 to low-30 mm range. The safest bet is to match by VIN/chassis code and engine, or bring the old hose as a sample when buying.

How often should the radiator hoses be replaced?
For most 1990s Daihatsus, every 4–6 years or 80,000–100,000 km is sensible. If there’s any sign of cracking, swelling, oil contamination, or persistent coolant smell, replace sooner. It’s smart to renew clamps and coolant at the same time.

Can universal flex hose be used on a Gran Move?
It can in a pinch, but a molded OEM-style hose is strongly preferred. The correct bends prevent kinking under load and ensure proper clearance from belts and fans. Use universal only short-term and replace with the proper molded hose when possible.