Quote:
Originally Posted by duxthe1
With your strange symptom I would suspect that the version coding in the ACC module could be incorrect. Fans tend to act tweaky when the programming and hardware don't match. Sounds oddball but is more common than one would think. Need to have a high end MB shop check and verify the version coding in the ACC and possibly other modules.
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His symptom is not so strange, if he has the N65 pulse-control module providing power to the M4 auxiliary fan.
It shuts down the fan if it detects too little or too much current, acting exactly as he described. I doubt it's a version coding problem.