Hi I have an ongoing problem with my 1.9 td galaxy mk2. The original problem was the engine took a long time to warm up, if I drove for a few miles then turned off the engine for a minute and then continued driving it would then quickly attain the right temp. It was as if the stat was faulty. I have changed it and it now seems to take the same long period to warm up but if i,m coasting down a long descent (we live in the alps) the temp drops back down and the heater cools. Having changed the stat i,m now at a loss as what to do next. Is there a particular way to bleed air from the sytem? and does the stat have to sit in a certain orientation in its housing i.e. 2 oclock, 3 oclock (its in the right way). Thanks.