BMW Questions? Ask a BMW Repair Expert for Answers.
Do you know what fuse 25 powers?
As for the overheating condition the condensor is heat soaking the radiator. You mentioned that you replaced the pusher fan and the mechanical fan clutch is ok. I am suspecting the fan clutch is failing it can work enough to make the fan turn just not enough for it to cool the radiator. There is a test you can perform. You will need to do this very carefully I have performed this test 100s of times if you are not comfortable with it then I recommend you bring it to a repair shop for them to perform it.
The test is with the engine up operating temperture and running slowly try to stop the fan with your hand. If you can stop it then the clutch has failed and will need to be replaced. If you can not stop it then it is ok. If you have never replaced the fan clutch then it is long overdue to be replaced.