2002 Volkswagen Beetle engine cooling

not sure exactly where your leak is or what you mean by cooling system leaking.. but if it's the coolant temperature sending unit, it's a 5 minute or less job.. Oreilly's sells sensor for about 16 bucks including tax.... it's held in place by a plastic U clamp you simply pull out with a scredriver and then pull it out with some long needle point pliers so you won't drop it.. sending unit/sensor is rigth valve cover vaccum hose on right side of engine (between engine and airbox)... has a 4 pin connector..if you have stock one,, it's a black sensor.. new and better one is green.. heard people replacing it for slight improvement in gas mileage even when there was nothing wrong with stock one... good luck .