fill the tank up and let the car get upto temp and then pop the bonnet and listen for any hissing sounds, could be a pipe that has a pin prick hole in it. if there is no hissing then fill it up, start it up and look undneath the car to see if there is any water pouring out, if if there is then where the drips are comming from that will routhly tell you where its leaking from!

if theres alot of water leaking from the cam belt side of the engine it could possible be your water pump. Also check under your oil filler cap for traces of whity gunk, if there is this then its a possible head gasket failure

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Audi A4 Cabriolet 2.5TDI 163 Sport
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