Hi guys, driving the car home the other day....the temp needle went up to the A in the the normal so put the heating on full to reduce the level the needle was at.Driving it the day after the neelde went up further so again put the heating on...this brought the temp down. Took it for a drive the other day to test it and see what symptoms I was getting and it was going all the way up to the line just near the red over heat mark so I switched the heating on again and this reduced the tem again but not very much...I kept letting it get a little warmer then switched the heating on again to reduce the temp and it did reduce it. My first thought was maybe the thermostat is shot so I have swapped that and bled the system through (getting full heat through vents) I checke d the old stat in boiling water in a pan and it was working. I have checked for water leaks and can see none and when the stat was out I stuck my fingers in and turned the water pump and it all seems ok. It doesnt appear to be losing water until it is really overheating when it then leaks from the bottom driver side pipe of the rad. I have had the rad off and checked that and it all seems fine with no leaks.The fan isnt kicking in when the car is overheating I am pretty sure it usually kicks in when the temp is on around the M. I dont think the head is shot as there is no gunk etc. I have noticed that since I have bled it and it has overheated that when I switch the car off the water level goes down in the filler bottle. I will try bleeding it again and see what gives. Any advice greatly appreciated.