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Message: <blockquote data-quote="awyeah" data-source="post: 423299" data-attributes="member: 19607">Thanks everyone for the info. I think to have mis-leaded some information, I was not aware with the radiator tank capacity. After doing a search online, I found that the E36 radiator tank can normally fill in 2+ gallons, which is around about 7+ litres. Previouly, I only saw the volume of the alternator cooling duct (attached picture by z///). What I mean't is weekly, I normally fill, 1litre of water (1 disposable plastic water bottle) and the radiator fills up to the max.How to inspect the "bleed screw" check it when the engine is hot and running? I filled another bottle of 1litre today so the water is at maximum, there was some left in the bottle. After that i started the car, noticed some leaks from the bottom, leaked for a while, after that it was okay. Drove the to office, after that inspected below, there was no leakage. I believe the initial leakage after filling the water to the max is the problem.Also regarding the cooling system, for the e36 aircon fan, should the aircon fan start immediately or sometime after you start the aircon? or it is used only when necessary? its speed varies based on the temperature of the engine?Is 55-60% temp acceptable on an E36 hot day with the aircon running? Normally my temp indicator is 50%.</blockquote>