How you clean your HV battery fan assemly

With a gen 3, removal of the fan seemed "complicated", so I just left it in place, cleaned with q-tips, and some isopropyl alcohol IIRC. For the ductwork ran one of those dusting boas through. Also used wet/dry vacuum on blow to dust out the whole area.

 

Much more important to clean it regularly enough than to get it "good housekeeping award clean" once.
More often if you have pets who ride along (based on the pic you don't seem to).

 

never even looked at mine, no doubt they had some dust on them

 

Mostly a problem for people who have dogs. (My son and his dog live with us. The animal has never been in the car, yet his hair is all over it. It hitchhikes in on our clothes.) In any case, the fan cage cannot be removed from the motor. Believe me, I tried. It is molded directly onto the shaft. So while plastic fan cages can often be washed with soapy water, it isn't an option in this instance. Q-tips, pipe cleaners, a toothbrush, and a vacuum cleaner are the tools of choice. If the unit has been removed from the car it could also be blown out with compressed air. Just get a firm hold on the cage so it doesn't spin, as it might be possible using that method to spin the shaft too fast for the motor's bearings and so damage it.