I’m gonna start off with this. I bought the mini back in October 2024. Whoever owned it before through a ton of head gasket seal in it and it worked it lasted until November. The fan completely quit working beforehand before the rebuild. I tore everything down. Had everything checked and put it back together. During that time I have replaced the water pump I replaced the thermostat and I have four more thermostats on hand. Replaced the radiator replaced the fan. Everything coolant related has been replaced.. replaced aux pump. The original one started sounding like a rock tumbler..
even with everything replaced still nothing.

My issue is I’ve checked relays. I’ve checked fuses. I took a spare thermostat out. And boiled it up to 300°. For test purpose. Not using the car to warm it up.. “water pan method “Since I’m not getting any fans at 200 to 225. At all, it doesn’t attempt to do nothing. Anything about 285 the fans kick on. That’s regardless of what temperature since I put in because I’ve taken any out of other thermostats just to see if it was a bad one. Fan does not kick on with the AC fan doesn’t do anything there’s power where there needs to be power at. I triple checked the only way the fan will run is when I pull the connector off the temperature center. It goes into that safe mode I got a spare relay that I took apart and tried. I can kick the fan on that way by just pressing it. I am just mind bod what’s going on because the engine can’t take 285° it is a 2009 mini Cooper JCW.

 

What persistent BMW fault codes are recovered with a scan tool?

 

only two fault codes are for the aftermarket headlights.
nothing else

 

What scan tool? Can it see all BMW codes?

 

yes. It’s the foxwell/schwaben… and there’s nothing other than what I’ve already described other than headlight fault codes.

everything keeps coming back fine.

 

Possible DME issue?

 

that’s what I’m suspecting.
I’m going send it out to get tested.
for some reason I don’t think it should be -54 degrees

and with everything swapped out multiple times… it’s gotta be

and because of the thermostat not opening correctly? It boils over. Vacuum it down it hold pressure more than 48hrs. So computer is the leading indicator