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I've seen this before , the whole unit is in trouble I'm pretty sure. You need to remove the fan and see the connection near the fan motor . It is probably corroded !
Yes , not the big connector with 4 pin .where the wire enter in the motor, those 4 wires are not in a connector . They just go in , in some sort of plastic gel , if you look closely you will see some corrosion !
It's a fan from a Porsche cayenne or the Touareg that i found on Google just to show you what I meant , there is something going on in the module, sort of a short circuit that makes the fan blow so hard , can't explain why but it happen. I never tested it tough. But I'm pretty sure you wil find corrosion and the problem is right there !
By experience , I would remove the fan , which is pretty easy with one clip on each side , and remove the 4 torx 27 bolt and see if everything is sealed and ok ...