So I noted a fair amount of coolant on the garage floor, located near the center front of the car. Took the car to the Mini dealer, and they pressurized the system 3 times and also drove the car and couldn't get it to leak. Any ideas? I have a scan gauge and it hasn't been running hot.

 

Check the connections to the aux.water pump ( S and JCW ) since most have been replaced and maybe a connection was not tight. Also I had a leak in the coolant expansion tank on the very bottom , hair line crack that should up after a while only leaking little bit and dripped down the reservoir line near the front of the transmission.

http://www.ecstuning.com/Search/17137823626/ES2166017/



Other then that the coolant lines to the turbo ( if you have an S ) are in that location. Other then that those would be possible solutions.

What year and model do you have?

 

I have a 2011 MCS. After seeing the coolant on the garage floor I checked the expansion tank, and it was empty. I filled it with about a half gallon of water before heading to the dealer. The car is under warranty, so I guess I will monitor and see if it happens again. I think the coolant loss on the garage floor was from one time, and not over a period of time. I have a scan gauge so I can keep an eye on the water temp for this very reason. It usually runs between 210 and 220, but I noticed one day it got up to 230 as I was sitting at a stop light. The temp came down when the thermostat opened up (I guess).