do you have your heater matrix pipes blocked or are you using a bypass pipe?
If your using a bypass pipe like I previously had then I would recommend removing it, this will improve the flow to the radiator.
If this still doesnt work then we might need to look at the routing of the coolant pipes as it sounds like there is either a blockage, lack of pressure to pump round, an air lock or the coolant piping is somehow wrong????
When you squeeze the top hose at the rad and the top hose at the block do they feel like they have water in them?
Where is your temp sensor mounted? Near the radiator or the engine? You ideally need to mount it as close to the output of the engine block as possible.
The only other thing that I can think of is that the dash and sensors arent calibrated correctly together giving high/false reading - I dont know if this is possible with your setup!!?!!
by the way I was out in mine yesterday in the hottest part of the day and was not suffering with overheating issues, so theres got to be something a miss somewhere.....
Edited by cptkirk, 28 June 2010 - 02:19 PM.