Follow Gilly's advise on the HHT operation, it is in AAC-Actuations.

Reviewing my info, and your fan being mounted in front, you should have a controller mounted directly behind the left headlamp (N65/1) 6 connections. To the right and forward of the ABS hydraulic pump assembly. If the unit is there than I believe that it may be the culprit to your fan operation issue.

From this point forward Gilly will be able to provide you with more assistance because some of my info may be outdated.

Good Luck