Parts for your 2001 Daihatsu Gran move-Radiator cap

2001 Daihatsu Gran Move Radiator Cap

Based on the Daihatsu Pyzar/Gran Move workshop manual for 1996–2002 (Cooling System section) and AU/NZ parts catalogues from Tridon and Gates, the 2001 Daihatsu Gran Move uses a pressurised radiator cap mounted on the radiator neck, typically rated around 0.9 bar (about 88–90 kPa). The overflow bottle is non‑pressurised. So yes, a radiator cap absolutely applies to this model.

The radiator cap on a 2001 Gran Move is a small bit that does a big job. It seals the cooling system and holds pressure so the coolant’s boiling point lifts, helping the engine run at the right temp even on hot Aussie or Kiwi days. It also manages coolant movement between the radiator and the overflow bottle as things heat up and cool down, thanks to its two-way valve setup.

When the cap’s spring weakens or the seals harden, owners can end up chasing odd cooling gremlins—mysterious coolant loss, random overheating at highway speeds, a collapsed upper hose after cool-down, or a heater that goes lukewarm. A fresh, correct-pressure cap often restores proper system behaviour without bigger spend.

Servicing advice for Gran Move owners:

• Replace the cap proactively every 3–5 years, or sooner if there are any signs of swelling, perishing seals, corrosion on the neck, or inconsistent temps.
• Match the pressure rating to spec. For most Gran Move/Pyzar variants, that’s 0.9 bar. Check the stamping on the old cap or the vehicle’s service data.
• Only remove the cap when the engine is stone cold. If testing or bleeding the system, use a proper cooling-system pressure tester and follow workshop procedures.
• Clean the radiator filler neck before fitting the new cap so the rubber seats properly. If the neck is pitted or damaged, the best cap in the world won’t seal well.

Simple replacement steps owners or workshops can follow:

1. With the engine cold, twist off the old cap and inspect the neck.
2. Wipe the seat surface clean, check for corrosion or nicks.
3. Lightly wet the new cap’s seal with clean coolant and install firmly.
4. Top up coolant as required, run the engine to temperature with the heater on, and confirm there are no leaks or temp fluctuations.

Technical references used: Daihatsu Pyzar/Gran Move Workshop Manual (Cooling System—cap opening pressure spec listed around 0.8–1.1 kgf/cm² with 0.9 bar typical) and AU/NZ application guides from Tridon and Gates noting a pressurised radiator cap for this model.

Popular questions about the 2001 Daihatsu Gran Move radiator cap

What pressure rating should the Gran Move’s radiator cap be?
Most Gran Move/Pyzar models run a 0.9 bar (88–90 kPa) cap. Always confirm by checking the stamping on the existing cap or the vehicle’s service data, as market variations can exist.

What are the tell-tale signs the radiator cap needs replacing?
Common clues include unexplained coolant loss, a sweet coolant smell after shutdown, hoses that collapse on cool-down, rising temps at highway speed, or the overflow bottle not behaving as expected. If in doubt, pressure-test the cap and system.

Is the overflow bottle cap pressurised too?
No. On the 2001 Gran Move the pressure cap is on the radiator neck. The overflow bottle has a simple, non-pressurised lid, it serves as a reservoir for expansion and return as the system heats and cools.