Galaxy Mk2 (02) Tdi overheating. (150K) Suddenly overheated on Motorway. No appreciable water loss. Limp home. Checking this further and doesn't overheat straight away. Temp rises to the 90 and sits for awhile - which tells me there is water flow and thermostat working OK - but then climbs higher - especially with any load/acceleration. First time noted that the radiator fans didn't seem to be running - so checking those out now. Does somone know which fuse covers their operation. If that's not it then I guess there maybe a head gasket problem. Any help in diagnosis appreciated.