History is 01 with 125K. Coolant changed every year using Honda automotive coolant ( blue ). Started smelling coolant recently but no puddles or significant loss. Overflow tank level is ok. When I took out the right pocket to check / top off, the coolant in the neck was brown crappy, rusty looking stuff. Where did that come from??? I am going to tear into it and replace the water pump, flush it out and pressure test, check all clamps, etc, but can't imagine why the brown look to the coolant? Anyone have any ideas?