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Message: <blockquote data-quote="jarance" data-source="post: 230898" data-attributes="member: 21">planta, thank for clarifying the burst tank due to jam thermostat. basically, a thermostat when jammed in closed position will stop the hot water from being diverted to the radiator but circulated within the engine block and the water pump. In cool condition, the thermostat will be closed and water is recirculated within the engine block and the water pump. this will bring the engine to the optimum operating temperature in the shortest possible. As the water temperature heat up, the thermostat will open at a preset temperature and diverted the hot water to the radiator where the heat is extracted via convection (air passing thru the radiator via cooling fan). If the thermostat is jammed, the consequence is that the engine will overheat and other part like water hose or plastic casing will give way due to the extreme high temperature.  This will causes a rapid loss of coolant and absolute NO cooling medium for the engine. The consequence is that engine will lose power and visible sign of smoke will come from the engine bay. (gasket most probably blown due to overheating)Many people will usually topped up the engine with cold water without letting the engine to cool down first. This will further caused the engine block to warp and add further damage to the engine. Hence, DO NOT FILL THE RADIATOR WITH COOL WATER WHEN THE ENGINE IS HOT.That why a lot people tends to spend a lot of money when the expansion box burst but have to do top overhaul due to engine warp or blown gasket.If it any consolation, I seen that the E90 have the expansion seperated from the radiator. (just like the Japanese car)</blockquote>

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