leaking water inside and out?

i have a 1998 2.5 diesel think i was had when i bought it but that bye the bye. its been loosing water since the day i got it about a header tank every 2 weeks. never knew where it was going dreaded the hg but yesterday noticed a pink antifreeze stain on drivers carpet heater matrix jumped to mind so called jason from dudley think you all know him he is comming to check that out. but just been out in her and same liquid running outside to directly under header tank are the 2 connected or 2 diff faults would love your thoughts please meny thanks. worried nev