Hey Nick, I have a 2004 Mini Cooper s. I just recently replaced the radiator and bleed the system. Ran fine for a few days but then I noticed after I left the car sitting over night some of the fluid was gone. I've checked the hoses but they seem to be fine. I'll also notice a small wet spot underneath were the ac run off tube is. It's not water but radiator fluid. Any idea on what it could be?

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Could be the heater core. I would pressure test the cooling system, confirm there are no leaks around the engine. Then check the evap drain for signs of coolant.

- Nick