beebe

I have a 2008 audi q7, 3.6l. Today there was a significant leak of coolant on the passenger (right) side of the car. It was coming from a rubber bung in the engine compartment side of the bulkhead/firewall. Down below the coolant expansion tank between it and the engine. So it wasn't the engine that was leaking, but possibly the heater core? Or coolant lines going to it?? or? In my experience, heater cores normally leak inside the car. This was leaking to the outside.

Anyone know what is leaking and how do I get to it? I'm guessing I have to go in through the plastic shroud that covers around where the wipers go? probably have to take the wipers off to get in there?

I could get some pictures tomorrow, but it's dark now.

Thanks!

dukesean

We had similar leak couple of years ago. Leak from under the coolant expansion tank. Turn out the tank had a cracked bottom. A new coolant expansion tank took care of the leaks.

beebe

Thinking about it being a cracked expansion tank, I don't know how the leak would somehow go from the expansion tank through the bulkhead to then leak back out of the bulkhead. through the rubber fitting.

I will examine tomorrow to see if this is possible. Maybe I can post pictures also. I know sometimes fluid can travel in an unexpected way, perhaps you are right. Thanks for your comment.

beebe

Here’s a puzzler. The fluid leaking out is bright green. The fluid in the expansion tank is orange. I haven’t filled with anything but water.

beebe

So the coolant level is not dropping, this looks like a rubber bung. perhaps this is condensation from the AC? It was definately green the first time I saw it, but it was in a kroger parking lot. Perhaps I dripped into someone else's already leaked green fluid puddle.

Built4Sin

The coolant for VW, Audi, and Porsche is pink in color. Sounds like you have solved your issue; I bet like you concluded, you parked in a previously leaking other makers parking spot.