My 2000 750iL is giving an 8b code on my PEAKE tool (electronic thermostat control final stage). When I clear the code, the light comes back the 2nd time I start up thereafter (not the first time, the second. I also get Fd, which apparently refers to the aux fan).

Anyway, I want to replace the thermostat but I haven't been able to find a write-up on JUST the thermostat for the V12. Has anyone managed to replace the thermostat by itself, without removing the water pump and a lot of other components?

Thanks for any advice.