Hi not sure if u have read my post about leaking thermostat but it's been over a month now I work for a motor factors in Cardiff and had a local garage do the job who we supply parts to.well they fixed my thermostat about 2 weeks later a warning came on my dash about low coolant opened bonnet to find no water in bottle so topped up told garage they said keep a eye on it 2 weeks later same thing took car back they did a pressure test car was fine but could see antifreeze around thermostat so said try some rad sealant guess what yep no water again I feel as if the garage is trying to put it off correcting their mistake what shall I do next