In Reply to: A/C problems and Aux Fan and Temp problems posted by Mike on June 29, 1999 at 12:55:32:
I visited Salton Sea last year, it was 110 degrees and my aux fan fuse was taken out in my 530i, specifically as a test. With the A/C on, the temp gauge still never went past the middle mark.
The engine fan should provide all if not most of the air flow required to cool the radiator - it would pay to check the condition of the fan clutch. The aux fan is a bit of a kludge IMHO.