The car has brand new radiator, thermostat, the block has been flushed out a couple months ago. Now it still has brown sludge built up in the new radiator, car warms up quickly then sits at around 90C on most short drive but if i drive for a long time it can get to 98C, so either the water pump isnt keeping up/is stuffed which was probably never changed on a 15yo car, flow problems? or possibly something to do with the head gasket?