Ok so a long with everything else that is going wrong with the Megane it seems the car is overheating. So I checked the coolant. When I ipen the reservoir the coolant refills the reservoir after the pressure releases and then starts to drain away again and you can hear it down where the hear linkage is. When I start the car from cold you can hear water in passenger footwell which in assuming is the heater matrix. And also the heating in the car seems to be freezing and the temperature gauge shoots up and down. So not sure if this is related to my engine misfiring or things. (See other thread) any ideas?