MK1BTStroker

Hello fellas. I've been a on again off again member of various Audi TT forums and have gained much insight and information because of them. I am new to your community and have come here because I need your help and expertise.

I have a 2001 MK1 TT 225 6spd. It has undergone heavy modification and if anyone is that interested I can elaborate.

I have a coolant leak from a metal coolant line near the thermostat housing. It is not a leak from the thermostat neck or gasket. It appears to be a coolant bypass line for when the thermostat is closed. It does not leak while the vehicle is running, only while sitting cold. I have attached a picture of the area in question. Though it is not a picture of my car as I have not done any dis-assembly yet its a picture that accurately displays the spot the leak is coming from. I have tried to re-seat the part but it just moves back out. I'm totally confused as to how it is held in place or even what part this is for ordering a new one.

Any ideas?

Kris Hansen

I wonder if there's a pinhole from rust? Or is the pipe actually pushing out of the hole?

MK1BTStroker

The line is loose. Its unseated from the block casting its mounted into and there is no obvious way to tighten it.

MK1BTStroker

Okay guys got it fixed.

Here's the fix:
The fitting in question is a pressure connection made by forcing the fitting into the cast part of the block. I used a long brass drift and a small hammer to "gently" tap the beveled edge of the metal hose and re-seat it into the block.

Bottom line is if your leaking from here find a long, thin, solid object, get a good angle on the fitting and tap it back into place.

I hope this helps someone someday because as it stands now I think this is the only write up like this for our cars right now.