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Message: <blockquote data-quote="bmwky" data-source="post: 70518" data-attributes="member: 102">Eh how come this thread suddenly become Elwine's ?anyhoo....elwine  you can start with bleeding the system first. Bleeding the system is fairly easy, do it every time you change coolant. I change mine almost every  year.  The bleeder screw is on top of the themostat housing. Park you car on an incline. start the engine and remove the screw. keep adding water in the expansion tank until coolant seeps out from the bleeder hole, let it run a while befor you tighten the screw. To determine if your thermostat is the culprit, you can actually run the system without the thermostat. If there is no overheating then confirmed you thermostat is malfunctioning. Make sure also you  radiator fan is working/kicks in if it electric. If it is the clutch type then you can test if the cluctch is weak by using  a simple test.REzzy, back to your original question of coolant leaking. In normal running condition you should not be loosing coolant so rapidly. unless you drive you car a lot under very hot condition like in traffic jam and very hot days etc. If you are sure the leakage is not coming from the hoses, there is another avenue you can check. The coolant temp sensor has an o ring that will shrink over time. a lot of coolant can seep out from there overtime.</blockquote>