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Message: <blockquote data-quote="jarance" data-source="post: 419964" data-attributes="member: 21">JB, ask you dad how he flushed the radiator? There are 2  thermostats for the E46 cooling system. One for the engine and the other for the GB. Basically, only open when the set temperature have been reached. So if you are flushing with COLD water, the amount of water thru the thermostat is very minimal. If you look at the design of the thermostat, there is a small gap to allow small water flow during cold condition. Hot water from the engine would fully flow thru the radiator when the thermostat open. So how effective is the flushing when the thermostat is close when the flushing is done with cold water?Your picture show water stain on the expansion tank. It is not sludge. If the water is coming from the top, it could be due to a faulty radiator cap.To determine source of leak is to clean up all the water stain and recheck it for fresh water stain.Here is a picture of white sludge found in my radiator.<img src="http://i122.photobucket.com/albums/o271/pbjy/E46%20Radiator/P1040096.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://i122.photobucket.com/albums/o271/pbjy/E46%20Radiator/P1040094.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>