Overheating and fed up....

[JSeery]

The sand had to come from somewhere! It is either getting added to the cooling system somehow or something is causing the original casting to come loose and move about. Almost everyone that takes to time to clean the blocks out (they have a ton of sand and wire in there!) claim much fewer cooling issues. The only other thing I can think of is something is going on with the coolant that just appears to be "sandy". But if it is truly fine sand, casting sand could sure be the source.