Bleed Cooling System

NOTE:
- The cooling system of all Audi vehicles is filled at the factory with a mixture of water and antifreeze solution (G 11) containing corrosion inhibitors designed for year round use.

- Phosphate-free antifreeze prevents frost, corrosion damage, the formation of chalk, and in addition raises the boiling point of the mixture. Due to the higher boiling point operational efficiency is improved under full load, particularly in tropical climates.

- Use phosphate-free coolant/antifreeze part number ZVW237 102 whenever replacing or topping up. This applies to ALL Audi models for ALL model years.

- Recommended Mixture Ratios:

- Outside temperature Antifreeze (G 11)/Water

-13°F (-25°C) 3 parts to 2 parts
-31°F (-35°C) 1 parts to 1 part

Draining



- Loosen coolant hose to heater on rear of engine block.
- Loosen lower radiator hose.
- Remove cap on expansion tank.
- Drain coolant.

Filling



- Open vent valve screw (arrow).
- Fill coolant up to "max" mark on expansion tank.
- Observe vent valve; close when coolant starts to come out.
- Put cap on expansion tank.
- Run engine until electric fan comes on.
- Check coolant level and top up if necessary.

NOTE:
- When the engine is at normal operating temperature, coolant level in the expansion tank should be slightly above the maximum mark.

- When the engine is cold, the coolant level should be between the minimum and the maximum marks.