[C320-list] Coolant in fresh water

[Dave Hupe]

 Leonard-
No .... that doesn't mean the heat exchanger (tube) is leaking.  Each rubber end cap (you apparently removed the front one) has 2 large clamps on it.  One of the clamps seals the rubber cup onto the tube itself to seal the freshwater system.  The second large clamp seals the tube assembly onto the heat exchanger tank.  The 2 clamps effectively seal the 2 different systems from each other .... the freshwater.....and the system with coolant in it.  The heat exchanger tube itself is not sealed off from the tank until the front and rear rubber caps are installed and the clamps tightened. 
Hope this explains it sufficiently.
Dave Hupe1994 C320 (#32)Perkins Perama M30 Engine