the thermostat assembly will have a crack in one of the rounded corners, we replaced 2 yesterday. Part of ownership of an R56 series car. If your car has more than 60k on it, ask them to replace the coolant transfer tube that runs from the T stat to the back of the water pump housing-it is going as well and you will just have to pay t stat labor again to get it replaced soon......We never replace a thermostat without the transfer tube anymore. These are a 60k maintenance items on those cars anyore....
I just know that what you described, is exactly what happened when my electric water pump went out on my 5 series BMW last year. MM gave some great insight to be considered and focused upon for sure.
In the three years I have owned mine, I think I have had to replace every gasket and reservoir on the cooling system, and a couple oil gaskets. Lucky for me, I have an extended warranty, so the cost has been manageable.
I believe the first gasket to go was the water pump gasket. That one leaked at a pretty fast rate. I had to stop and add water on the 15 mile drive from my house to the MINI dealership.
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