Our database does not have any information on your vehicle so I do not know the system used.
The fan should be bolted on either with 3 or 4 bolts/nuts. You would have to loosen these to get the fan out. Normally the fan need not be removed for belt replacement. You manouvere the belts over it.
What you need to do is to get the belts loose by releasing the adjusting points(adjusters) and tugging at the belt.