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Hi there I am Annie and a new user and finding my way around this website!!! I have a 1990 205 GTi 1.9 which I brought from a friend 3 years back now... was properly maintained since new but sadly I have let the side down slightly as not as much knowledge as I would like to maintain it properly! Recently the pug (Pixi !!) has been getting slightly hotter than usual... almost boiling point so as a start point I decided to change the thermostat. We removed water thermostat housing to replace the thermostat and then subsequently removed the thermostat... the old stat came out with a little encouragement and there was a rubber washer seal left in place. The new thermostat comes with a new rubber washer seal so we removed the old one, cleaned in and around the areas where the housing meets the cylinder head, placed new rubber washer in the correct position against the head, installed the new thermostat and then reinstated the housing. Tightened up the bolts and refilled the system, however there is coolant leaking from around the area where the housing bolts against the head. Am I missing something i.e. a jointing compound paste, a gasket or a second rubber washer????? Given that the original came out with only the one rubber washer, what do you think I need to do??? Your help MUCH appreciated. Anne x