Parts for your 1999 Daihatsu Gran move-Heater hose

1999 Daihatsu Gran Move Heater Hose — What It Does and How to Look After It

Based on the Daihatsu Gran Move/Pyzar G3 workshop manual (Cooling & Heating section), the Daihatsu Electronic Parts Catalogue for G301/G303, and common-service literature for the HC‑EJ and K3‑VE engines, the 1999 Daihatsu Gran Move is fitted with heater hoses. These are the dedicated inlet and outlet hoses that run coolant between the engine and the heater core at the firewall.

On this Gran Move, the heater hose pair carries hot coolant from the engine to the heater core inside the dash, then returns it to the cooling circuit. That keeps winter demisting sharp and the cabin toasty without overworking the air con. If a hose perishes, splits, or swells, it can dump coolant, fog the windows, dampen the passenger footwell, and even lead to overheating — not the sort of excitement anyone wants under the bonnet.

Given the age of a 1999 example, any original hoses have long done their dash. Fresh quality hoses and clamps are cheap insurance, especially with Aussie and Kiwi summer heat. Both the 1.3 (HC‑EJ) and 1.5 (K3‑VE) variants use these hoses, routing can vary slightly, but the job is much the same.

• Inspection: At every service or 10,000 km, check for cracking, softness, swelling near clamp ends, and oil contamination. Squeeze-test when the engine is cold, any spongy spots are a red flag.
• Coolant: Stick with a reputable ethylene glycol coolant at the correct mix (commonly 33–50%). Refresh on schedule (about every 2 years/40,000 km) to protect the alloy components and the heater core.
• Clamps: Replace old clamps with quality spring or constant-tension types to handle heat cycles without loosening.

When replacing, it’s smart to do both heater hoses together and fit moulded hoses that match the factory bends to avoid kinks. Here’s a tidy approach:

1. Let the engine go stone-cold. Drain enough coolant to sit below the heater hose level.
2. Crack the old clamps and gently twist the hose to break it free from the firewall stubs and engine fittings.
3. Fit new hoses and clamps, orienting them exactly as the originals. Snug the clamps — tight, not brutal.
4. Refill with the correct coolant mix, set the cabin heater to hot, and bleed air by idling with the radiator cap off until the thermostat opens and the fans cycle. Top up and check the overflow bottle.

A quick recheck after a few heat cycles for weeps and coolant level keeps the Gran Move happy and the demister mint.

Popular questions about 1999 Daihatsu Gran Move heater hoses

Where are the heater hoses located on a 1999 Gran Move?
They’re at the firewall behind the engine — a pair of small-diameter coolant hoses feeding the heater core. One hose runs from the engine outlet to the core, the other returns coolant to the water pump side. On right-hand-drive cars, access is from the engine bay side of the firewall.

What coolant capacity should be expected when changing heater hoses?
You’ll typically lose a portion of the system during a hose swap, but the total cooling system holds around five to six litres. Have enough premixed coolant on hand to refill and to allow for proper bleeding.

How should the cooling system be bled after hose replacement?
Set the cabin heater to hot, fill the radiator, start the engine, and let it idle. As it warms, gently squeeze the upper radiator hose to burp air. Once the thermostat opens and the fans cycle, top up the radiator, fit the cap, and fill the overflow to the mark. Recheck levels after the first decent drive.