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Message: <blockquote data-quote="ICEMAN 68" data-source="post: 302146" data-attributes="member: 17">dude .... based on your picture of the coolant used, i think it's the normal type of coolant right ( The Green coloured type ) ?If yes , could be your water pump impeller rotor corroded ( if using a metal impellar) or plastic impeller broken ( if using the plastic type )  ..see what happens is that by using such type of coolant ( the green coloured-- non BMW type ) the impeller rotor ( metal type ) tends to get corroded fast and eventually will cause the rotation of the impeller not smooth or at times stuck happen .....so based on what you mentioned that now it seems OK, yes ...cuz the rotation of the impeller is somehow depends on the pulley and also the movement flow from all water channels therefore if this time you face the same problem , just get down and look at the water pump pulley .... is there any movement ( you may be able to see it as the belt will just keep on sliding on the pulley and the water pump pulley will not move ....Just to let you know that , it's better to use a metal impellar water pump with good coolant ...etc BMW coolant or the redline water wetter .... it's got some oil substance to avoid corrosion ....</blockquote>