Originally Posted by Blackjetvette97

Hi all,
I am having A/C issues in my '04 X5 3.0i E53. I have pulled all 4 red 50amp fuses under glovebox and all are good(NONE of them are labeled as "AUX FAN" whatsoever). I have a free-spinning aux fan(no binding) got continuity on it(+/-), got 12V reading from power harness to fan, fan does not rotate upon start-up or Max A/C activation or at normal op temp, etc.
Unplugged lower rad hose sensor, fan did not go on.
Is there anything else that is affecting the operation of the fan, causing these symptoms? Do the US non-diesel E53's have this MIDI format fuse wired in? I also have ared/cyan wire in my harness. I am kinda stumped.
Would Final Stage Resistor affect aux fan operation, above and beyond when A/C is commanded on......like upon startup test???

Any help or guidance would be appreciated.
Thanks

Steve