2010 Cooper base model

I sold this car in 2019 and bought it back recently. It sat pretty much the entire time it was not in my possession. I had to do some work to get it running smooth again, and when I did I took it for about an hour drive. Right as I was getting home the coolant started to get too hot and the car wouldn't rev past 3k. I noticed the fan wasn't turning on. There is a pending code for P2177 (lean at idle) but no CEL.

I've tested both Fan l and Fan ll relays and they work. I jumped the relay connectors and the fan comes on that way, but only for the first relay. The second relay has 0 voltage. I connected to the vehicle with INPA and turned the fan on using the controls. It turns on for about 5 seconds then shuts off again (not sure if that's normal when using INPA or part of the problem). The temp sensor seemed to be giving accurate readings using INPA and a Bluetooth OBD connector, but unplugging it will turn the fan on. I replaced it just to be sure since it is cheap and easy to do. When I had the sensor out of the thermostat housing I could see the coolant came right up to the sensor with no air bubbles. I still opened the bleed screw a few times just to make sure there was no trapped air. I've seen a few threads about the fan resistor going bad but my fan doesn't have a resistor, and like I mentioned I can get the fan to turn on manually. As far as I can tell there is no reason the fan shouldn't be turning on. Turning A/C on won't activate it either. I'm at a loss here. It's either something extremely obvious that I'm just overlooking or something odd is going on here. Any ideas?

I just ran the car again and monitored the coolant temperature the entire time. It peaked at 106 C (fan didn't turn on). Let it idle for almost an hour while monitoring everything and had the heat running. Eventually the coolant temp came down to 95 C and stayed there. Engine seems

 

I just recently had ours up to 108C (took about 1/2hr heater off 10C ambient temp) that seems to be the temperature. The thermostat starts regulating as it hovered there for an additional 10 minutes before I turned the car off. From what I’ve read if you disconnect temperature sander fan should come on. As for what temperature its supposed to come on at nobody’s been able to give a concrete answer on that subject.

 

I have the same problem with my 2010 mini cooper clubman. If the fan is not activated (on stage 1, if you have no resistor) it is probably because the relay is not receiving ground on pin 85 of the relay. Upon the correct conditions (roughly 105C), the ECU should ground the relay and then the fan will be activated. I think that stage 1 is achieved by triggering on an off the ground signal so the fan runs slower (not 100% sure of that however). The ECU might be the problem. I am planning on installing a manual toggle switch in my dasshboard to override the ground signal.