expated

I have a 2001 A6 Quattro 2.7T with 85k miles. Over the past 2 two years I've noticed it loosing about half an expansion tank of coolant fluid a year. I've looked for the leak but I can't find anything! Needless to say its pretty mechanically packed in there.

Today I actually noticed a small puddle of the expensive pink G12 stuff on the floor. Haven't had chance to dig any deeper yet though. Based the groups expertise is there a common failure or leaking location I should focus on?

Your support would be greatly appreciated!

georgeb944

Clean the puddle, locate exactly where it is dripping, jack up the car and look for the pink trail leading to the leak source.

You may want to consider pressurizing the cooling system to watch the leak in action.

expated

Pressurized the system to 15 psi when cold, went down to 13 psi after 15 mins. I believe the slow leak occurs after a lengthy time of running. I'm gonna run for a while and then get it on my mechanics lift and see what we can find.