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I like to update and seems like My Aux Fan problem of running very loud when AC is turned ON is fixed.
After replacing the A/C pressure sensor on the High pressure line I don't hear the Aux Fan going crazy. The Compressor is still engaging and Car is Cooling fine but no more Fan sound.
I need to Vacuum the R134a at local shop before I remove the Sensor, I used 15/16" Wrench and it was quiet tight before it get loose. After putting back the new sensor I add ~12oz of R134a and bring to 28psi at 80F and it start cooling again. I believe E70 takes 1.1lb +- of R134a on a complete empty system.
Never over fill the R134a it can cause problems. I will check it out with local shop how much more I need.
See the 2 pics of the part I replaced $35 and the location of the part on my E70 N62.
Mfg Part # 64539181464
A/C pressure sensor located in A/C line from receiver-drier to evaporator.
This sensor attaches to the a/c line and detects the amount of line pressure for the a/c compressor to engage. Works in conjunction with the climate control system and the air conditioner.
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