Leaking coolant on 2007 mini cooper. The dealership wants $445.85 to fix/replace everything. A friend of mine said I should just put something called "Bars Leak" into it to stop the leakage. If I do that, is there a chance of doing more damage to my mini?

Hi, W/D here.

The short answer is "it depends". If the coolant leak is evident (showing), then you should first tighten up the leaking component if such can be done, paying attention to the torque values for the parts. These are obtained from a manual, which is available from an auto parts supply store. Secondly, if the leak is on a part that is easily replaceable, and tightening doesn't remedy the problem (as in a bad radiator hose clamp or similar), replace the defective part. Thirdly, Bars Leak (or similar) is OK to use. Just make sure to read the instructions label to make sure that it will be of value in your type of leak. Some exclusions may apply. Talk with the personnel in the auto parts store about your issue, and they will make recommendations. Lastly, again depending on the leak site, You can perform the work yourself. The above mentioned manual is invaluable in this effort, and provides a wealth of other information as well. I have a manual for every vehicle that I own. They provide everything you need from changing light bulbs to engine rebuilds. The cost is usually in the $20 range. Should you elect to tackle thew repairs yourself, take pictures before you start. Mark and tape the wires removed, and make sketches of what connects where. Evey mechanic that I know does all of the above and it makes re-assembly muuuuuch easier.
Best regards, --W/D--