Flushing Coolant System?

[B.I.G Steve]

Just bought an Audi A4 B6 1.9tdi, Its low on coolant whats the best way to flush the system out and how? help or step by step would be brill thanks guys.

[Crasher]

Just top it up.....

[B.I.G Steve]

Just top it up.....

Needs flushing coolant looks all moggy orange mucky so needs doing.

[Crasher]

The coolant used, G12, is orange and muddy. The latest spec is purple, G13.

[B.I.G Steve]

The coolant used, G12, is orange and muddy. The latest spec is purple, G13.

Arrr okay , just bought some G12++ am i fine to use this even tho it says G12 heard a few say its fine?

[FrenchAudi]

The coolant used, G12, is orange and muddy. The latest spec is purple, G13.

We've been here before! A3 Coolant and Coolant Hoses

If it has G11 it should be clear and pale blue, if G12 through G13 it should be clear and pink.

If it is orange and muddy, it is full of rust, or just maybe a mixture of G11 and a later liquid, and should be flushed thoroughly with clean fresh water.

The system should be drained and refilled and the radiator and heater matrix back flushed until clean water comes out.

Detailed instructions for this can be found in a Haynes manual or similar.

My cooling system contains 7.5 litres, so, after flushing out, for a 40% mixture (2 parts G13 to 3 parts distilled water) giving protection to -24ºC, I add 2.5 litres of G13 to the system and top up with distilled water..

If you bought G12++ this can be mixed with any of the G12 to G13 liquids, but NOT with G11.

[Crasher]

Yes G12++ is the previous version, the muddy one...