Back in May I think it was my Plus 8 was in for MOT and I had given it a bit of welly on way in to the testing station, it was a very hot day and as she was being checked for emissions she spat fluid out of the overflow from the bulkhead header tank and the fan just carried on running for the duration of the test.
Normally it would be cycling.
Once she was outside again and cooled down a bit she was topped up with around a Litre of water/antifreeze by the engineer and the fan has operated correctly ever since.
p.s. If it does not stop in the cooler weather it would overcool the engine which is never a good idea for obvious reasons.
