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Q: REPLACE EXPANSION TANK on 2004 BMW X3

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I HAVE A CRACK IN MY EXPANSION TANK-HAVING TROUBLE DETACHING AT BOTTOM-WAS ABLE TO UNHOOK UPPER HOSES
HOW IS IT ATTACHED AT BOTTOM
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Do you have automatic transmission? If so, there is a secondary thermostat for the transmission cooler right where you are having trouble disengaging it. Be careful, and I recommend you do it yourself. The place I go to broke this small plastic thermostat while replacing my leaking expnasion tank and cost me an additional $100 unnecessarily. They claimed the thermostat "was already broken." Yeakh, right. Alternatively, point this out to the place you are taking it to. Unfortunately the TIS instructions for expansion tank replacement are not very detailed.
there is another spring clip you have to get from the bottom and a temp probe. if you remove the oil cooler to one side it's much easier.
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