I have to fill my coolant in my 2012 Coupe S R58 with the N18. There is no bleeder screw. Below is a picture of the bleeder screw location from my donor car engine (2013 Roadster R59 JCW) identifying its location on the thermostat housing.



Now a picture from my 2012 there is some sort of sensor in that location.



Without tearing everything apart I looked all over and couldn't find it. Anyone know what the deal is?

 

I can't find a bleeder mentioned in the TIS for the N18 at all.
The coolant fill & vacuum bleed procedure lists some cars as requiring manual bleeding, but the N14 and N18 aren't listed.

The RWD variant, the N13, is listed, and has a bleeder on the top of the expansion tank, but neither Mini variant do.

 

Both engines above are N18. 2012 S and a 2013 JCW

 

Should be right next to that sensor, but looks like it might be under the fuel pump.

https://assets.ecstuning.com/product...8832_x800.webp

One of the best investments I made was a vacuum coolant fill tool.

 

That is exactly what the one on the JCW engine looks like. I used everything but a mirror to try and see it. I don't think it is there. Might have to invest in a vacuum tool.

 

The first time i used the vacuum tool, it took me longer to get everything set up than it actually took to fill the cooling system. It was an amazing experience.

 

Of no less importance than solidly filling the coolant system is the vacuum test, especially after doing component replacement, such as the stupid water-pipe/thermostat assembly. Pull a vacuum on the empty coolant system and watch to see if the lower radiator hose remains collapsed for more than a few minutes. If the hose stays flattened, you know that all of the gaskets and o-rings are in good shape and you will have no leaks.

 

I actually purchased a coolant vacuum filler. It will be here this PM. The only coolant components removed were hoses so I hope I don't have a leak. Won't hurt to check it though.