The Hilux fan only has 3 small slot head bolts that come out to get good access to vacuum it out.
Mostly they build up in the fan and stop it turning
You can blow compressed air back down all the outlets and you will get most of their building materials out
So if you ever hear a flashing or clicking sound in the fan body don't keep running it.
When it stops and shorts out the smell is horrendous and you will be driving around for a month with the windows open no matter how cold it is
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