As far as I am aware the AC has always been driven off the power steering pump via its own stretch belt.
The outer Aux belt has only ever driven the alternator and power steering pump on the cars I’ve had.
The only difference and I think this could be your problem is a change in power steering pump, later cars have the hydro electric system which uses the thinner belt where as earlier cars had the standard hydraulic system which uses a much larger/wider stretch belt.
With yours an ex service car there could be some other changes maybe?
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