View Full Version : Coolant Leak under passenger side of car? Need help!

11-17-2010, 08:05 PM
I posted this earlier:

Wierd Leak!?!
I have a 1996 Quattro, and today I noticed a strange leak behind the right front wheel, and about a foot in, from the right side of the car. I put a paper towel underneath, as it was leaking about 1 drop every 10 seconds. Its colorless, and odorless, so I'm hoping its water. But its got a slight greasy feel to my fingertips. Don't all vehicle fluids, HAVE to have a color, so you can identify it? It rained today, so does that have anything to do with it? Water making its way down the frame of the car somehow? I know this sounds a little Noobish, but I'm trying to be proactive to catch any little thing.

IT IS COOLANT! I shined a flashlight onto the small puddle and its green, and smells like coolant that I bought today. I'll try to post pics, but its pretty simple. Its leaking NOT under the engine, but further back toward underneath where the passenger side seat is, outside under the car. I tried to feel around for any hoses, but couldnt find any....I don't think there are hoses that far back under the car anyways!?! How the hell is there a coolant leak coming from that area of the car?

11-17-2010, 08:31 PM
So you put GREEN coolant in your Audi? Not cool.

Are you losing (using) any coolant?

I guess I would check the heater core hoses if you think the leak is that far back. Those are the only coolant lines that go back to the firewall. What really needs to be done is to pressure check the system and watch where it leaks out of.

11-17-2010, 09:38 PM
Well, I checked the fluid level in the resevior and it was just below "min". The color of it was greenish, so I went to an auto parts store and got "Peak" 50/50 mix, which was also green, and "safe to use on all vehicles". Then I see your "not cool" comment, and google search "Audi's and Coolants", and come to find out that I have to use some "g12" stuff. This is frustrating.

11-17-2010, 09:50 PM
Your best bet would be to get a cardboard box and cut it up and put it under the engine bay. Make sure your belly pan is off under the car and start it up and let it run for a few min then start peeking around to see if you can find a leak. It sounds like a heater core leak.

Audi needs G12 coolant. You can pick it up @ VW / Audi dealer or maybe napa. Dont mix the coolants. You must do a full flush and refill

J Ozzie
11-18-2010, 12:58 AM
my guess is the stupid coolant flange on the back of the block.. (my buddie broke mine....) I had a part ordered from ECS tunning and it was messed.. its like it wasnt the right part but i made it work because i needed my car on the road and couldnt wait any longer.

This is what i ordered
the leak is most likely to be at the back where your coolant temp sensor is. (the piece with the slat in to the front of the flange, when you look down youll see the sensor its green)

Get a flashlight and look at the back of the block facing down. If you cant find it follow the metal hose that runs along the Intake Manifold most of the times the o rings shrink and get old causing it to leak.. The job is a REAL PITA but since ive taken my manifold off quite abit it was a 15 min job.. I had to load up the front side of the flange with High Temp Silicone because as i said before the part just didnt work. But all is good :)

This is the coolant you must use.