Why a Radiator Flush is Important in Australia
Your car’s cooling system works hard, especially in the Australian climate. Over time, coolant can degrade, causing corrosion, scale build-up, and poor engine temperature control. A radiator flush clears out old coolant and contaminants, ensuring your vehicle runs cooler, longer – whether you're stuck in Sydney traffic or cruising through the outback.
What You'll Need
- Jack and jack stands
- Drain pan
- Radiator flush/cleaning solution
- Distilled or demineralised water
- Recommended coolant (check owner's manual)
- Funnel
- Gloves and eye protection
Step-by-Step: How to Flush a Radiator and Replace Coolant
1. Prepare the Car
- Park on a flat surface and let the engine cool completely.
- Jack up the vehicle and place it on jack stands for safe access to the radiator underside.
2. Drain the Old Coolant
- Remove the radiator cap (caution: only when the engine is cold!)
- Locate the radiator drain plug, typically at the bottom corner of the radiator.
- Place a drain pan under it and remove the plug to drain the coolant.
- Dispose of the old coolant safely at your local waste facility – never pour it down the drain.
3. Clean the Cooling System
- Reinstall the drain plug.
- Add radiator flush/cleaning solution into the radiator.
- Top up with distilled water.
- Start the engine and let it idle for 10–15 minutes to circulate the solution.
- Turn off the engine and allow it to cool again completely.
4. Drain the Cleaning Solution
- Repeat the drain process as in Step 2.
- Ensure all the flush mixture is fully drained from the system.
5. Flush with Distilled Water
- Fill the radiator with distilled water.
- Run the engine for 5–10 minutes to flush out remaining residue.
- Turn off, allow to cool, and drain again.
6. Refill with Fresh Coolant
- Refill the radiator with the correct coolant and water mix – usually 50/50 unless otherwise specified.
- Check your owner’s manual or vehicle logbook for the right type (e.g., organic, hybrid, or long-life coolant).
- Use coolants that meet AS 2108.1 standards for Australian conditions.
Shop High-Quality Coolants for Australian Vehicles
7. Bleed the Cooling System
- Start the engine and let it run.
- Watch the coolant level drop as the thermostat opens – top it up as needed.
- When the engine reaches normal operating temperature and the level stabilises, turn off the engine.