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.