Hi
You need something called Radiator Sealant or Sealer but ive seen my dad use it before. If i remember correctly simple add the solution into the radiator and it will seal all the cracks which leak water.
You should be able to get it from any good car repair/equipment shop. Should cost around 5quid.
just to give you an idea what your looking for, here is a link....
http://www.speeding.co.uk/acatalog/STP_Fuel_Products.html
Read back label for full instructions on how to use.
Hope this helps.
MJ.1, April 2008
