Pressure/relief tube at back of V12 TT?
Thread Starter
Senior Member
Joined: Apr 2016
Posts: 287
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From: Colorado
2004 W240 Maybach 57
Pressure/relief tube at back of V12 TT?
There is an old style metal radiator cap with an overflow tube sticking out toward the firewall at the back of the V12 TT (M285/M275). There are ridges that would accept a drain hose, but there is no drain hose that I could find anywhere nearby. Something has flowed out of this relief tube in the past and has dried into a crusty, white powder. Is the V12 TT supposed to have a drain hose for this relief tube?
Last edited by SilberGrau57; May 15, 2017 at 01:39 PM.
Thread Starter
Senior Member
Joined: Apr 2016
Posts: 287
Likes: 74
From: Colorado
2004 W240 Maybach 57
MBWorld Fanatic!
Joined: Nov 2010
Posts: 2,605
Likes: 343
From: Welwyn, Herts, UK
2006 S600
Yes, there's no drain hose.
The secondary / low temperatures / charge cooling system should run pretty cool, and never get near boiling over. It kind of suggests the IC pump isn't working.
The system will also need filling, which is waaaay difficult.
Nick
The secondary / low temperatures / charge cooling system should run pretty cool, and never get near boiling over. It kind of suggests the IC pump isn't working.
The system will also need filling, which is waaaay difficult.
Nick
MBWorld Fanatic!
Joined: Jan 2008
Posts: 6,150
Likes: 533
Mercedes
There is an old style metal radiator cap with an overflow tube sticking out toward the firewall at the back of the V12 TT (M285/M275). There are ridges that would accept a drain hose, but there is no drain hose that I could find anywhere nearby. Something has flowed out of this relief tube in the past and has dried into a crusty, white powder. Is the V12 TT supposed to have a drain hose for this relief tube?
here is is a detailed write up how to install an overflow tank onto that drain hose for $30
https://mbworld.org/forums/m275-v12-bi-turbo-platform/562924-intercooler-circuit-overflow-reservoir-2.html
