Hi guys I know this question has been asked a thousand times but I can't find much info on the 2.5 tdi engine code ake my temp gauge only ever reaches 70 degrees so I'm going to replace the thermostat and temp sensor is there a guide anywhere for doing this on a 2.5 ? Also would this cause problems with starting the car when it's warm ? When it's cold it starts fine with no issues but when it's been driven and heated up and turned off for about an hour it's very difficult to start I think that because the temperature gauge is faulty its messing up the air fuel mixture when starting would this be correct also I seem to have poor mpg top would this be another problem caused by the temp sensor ?