So I had myself a crack at the top of the radiator. No water pump problems, but decided to do clutch (wrong part arrived), waterpump, belts and hoses while I was at it. Put everything back together, only snapped one harmonic balancer bolt. Developed leak at base of waterpump, or so I thought. Removed waterpump replaced gasket, leak still there, but slower. Turns out it was the small pipe behind waterpump... argh