gk1

It's funny but almost all Audi fluids turn brownish as they get old, but here are their usual starting colors.

Power Steering : Green (Also your most likely culprit.)
Coolant : Pink/Red
Differential : Honey yellow
ATF : Red or clear/yellow
Brake : Clear/yellow
Washer : Blue

If you are concerned I think there is a site online that sells UV dye that you put in the suspected fluid and you can see it with a black light when it leaks out.

KevinGary

Open the hood, the coolant is pink.

kemer1

As kevin said, VW/Audi G12 coolant is pink. The ATF is gonna be either reddish in the older style. or blue if it was replaced since the TSB was issued. Window washer fluid is a light blue color...as far as the green goes...no idea.

A4 to A8

I am noticing the same GREEN LIQUID frozen in the morning. It's on the passenger side of the hood and drips starting from a few drops frozen because of the weather and accumulated to an icicle about the size of 1/2 of my hand.

At first I thought that it was the A/C but why would water from the A/C be green?

It should be the coolant since it is green but no warning lights, no overheating, nothing....everything seems O.K and why would it freeze if it was the coolant? Isn't it supposed to be antifreeze?

Woul it be the coolant overflowing?

Am I missing anything from the manual? Should I be seeing the dealer soon?

Any ideas??

KevinGary

If your coolant is green you have the wrong coolant in the car. Coolant in an Audi is pink.

Ramon Pagan

The transmission fluit on a audi is green I know because I just took my son audi to the mechanic for a transmission leak and I bought the fluit.

sswari

Yep, ATF can be green if Lifeguard 8 Also some Power steering fluid is a dark green. And as was mentioned a couple of times, coolant should not be green.

Tim Baker

The only green fluid in mine is power steering fluid. I also have a slow leak and keep a can handy.
CHF 11S

Chf11s

A6 4.2 Vier

When all else fails use your other two senses, smell/taste.

sswari

If you are using Lifeguard 8, it could be your Trans fluid as well. so the only 2 fluids so far identified are the PS and the AT(sometimes.)