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Hi All, To avoid further hi-jacking Julie's raceline water rail fitting thread further, thought I'd put this into a new thread. So my car decided to deposit all its coolant on the floor the other day, and suspecting a dodgy thermostat housing I've ordered the Raceline water rail. Whilst waiting for it to arrive, decided to strip out the existing set up This looks like the sender unit for the temp gauge in the dash and looks pretty corroded/knackered, so I think this might be the cause of my leak. Everything else looks fine. Does this thermostat look right? I figured that whilst cold it should be sealing the coolant path but there's a gap of around 1cm? Raceline recommend getting rid of the expansion tank that I'm currently running, but I note that when @Julie Hall - AO Representative, Peak District AO fitted her water rail it was kept? Image supplied by Raceline is below As you can see they're running the over flow from the 'stat housing into an overflow bottle down near the headlight. This system looks like a simpler set up and would reduce potential future failure points, so I'm throwing this to the WSCC experts - keep the expansion tank on the scuttle, or set up as per raceline? Thanks All! Mat