Parts for your 2006 Holden Commodore-Radiator

2006 Holden Commodore Radiator — Purpose, Care and Replacement

A radiator is absolutely fitted to the 2006 Holden Commodore, whether it’s a late VZ or the launch-year VE. This is confirmed by Holden/GM service manuals for VZ and VE models, Gregory’s/Haynes workshop manuals covering VY–VE, and AC Delco/GM Genuine Parts catalogues that list direct-fit radiators and caps for 2006 Commodore variants. The Commodore’s petrol engines are liquid-cooled, relying on a front-mounted aluminium crossflow radiator to manage engine temperature and protect against overheating.

In everyday driving, the radiator dissipates heat from the coolant circulated through the engine. Fans and shrouds assist airflow at low speeds, while the pressure cap maintains system pressure to raise the boiling point. On many auto Commodores, the radiator also houses an integrated transmission cooler, so healthy coolant flow indirectly helps ATF temperatures too.

For owners, keeping the radiator in good nick is cheap insurance. Use the long-life, OAT-style red coolant specified in Holden documentation (Dex-Cool type) mixed with demineralised water to the correct ratio. Most logbooks call for coolant changes at multi-year intervals, if the history’s unknown, a full flush and refill is a smart move. Always check hoses, clamps, and the cap when servicing the radiator, and keep the fins clear of bugs and debris for clean airflow.

Replacement becomes sensible when leaks appear around the plastic tanks, there’s green/white crust at seams, fins are crumbling, or the core is partially blocked. If it’s an auto, inspect ATF for any milky contamination that could hint at a failed in-tank cooler. When fitting a new unit, match the part to engine and transmission type (V6 vs V8, manual vs auto), replace the cap and upper/lower hoses if they’re aged, and fit new clamps. Bleed air properly after refilling—heater set to hot, engine warmed, top up as bubbles purge—then confirm fan operation and hold system pressure.

• Signs it’s time: rising temps under load, sweet coolant smell, low coolant with no obvious puddle, brown/sludgy coolant, gunky fins, or persistent coolant warnings.
• Quick care tips: keep the correct coolant, don’t top with plain tap water, wash bugs from fins gently, and pressure-test during scheduled servicing.

Popular questions

What coolant should go in a 2006 Commodore radiator?
Holden specifies a long-life red OAT coolant (Dex-Cool type). Mix it with demineralised water to the recommended ratio. Sticking with the right chemistry prevents corrosion, protects alloy components, and helps the water pump and heater core last.

How often should the radiator be serviced or replaced?
Follow the logbook interval for coolant changes (commonly every few years) and inspect the radiator at each service. Replace the radiator if it’s leaking, blocked, or has brittle tanks/fins. If the vehicle’s history is unknown, a flush, new cap, and fresh hoses are wise.

Are auto models using an in‑radiator transmission cooler?
Many 2006 Commodore autos route the ATF through an integrated cooler inside the radiator end tank. Keep an eye on coolant and ATF condition, if either looks milky, stop driving and have it checked immediately to prevent transmission damage.