Help water on floor

[sheep]

Okay folks im going outta my mind here , after a coolant dump i decided to investigate and found that my 2nd pressure cap was faulty and that my expansion bottle had a crack in it.

So while i was repairing the above i replaced with the help of a very good friend the complete clutch system and all rear cv boots and repaired and tested the bottle and fitted the new cap , so i fire her up for the first time and all is fine , she warms upto 80 degrees , i turn her off and alls good.

I then 30mins later put her back into the garage shut off to find water dripping from the drivers side rear wheel area again , but this is cold water , im now at my witts end any ideas please and thnx in advance.