A while a go the mrs had a leaking radiator pipe in her 205 and after replacing it I noticed that there was a 'lump' of rusty orangey coloured gooey something in the coolant overflow tank. Then a couple of days ago i checked mine to see if the water level was ok and the water in mine looks the same colour!
Is it something that people put in there? Some sort of coolant?


Thanks in advance.