is yer bus left or right hand drive? I researched this before cutting the hole in my dash and found that for LHD vans, the fresh air fan switch goes in the hole nearest the steering wheel, to the left hand side, near the headlamp switch. If you get her head in under the dash, or use a mirror, you'll see that there is a bunch of pre-drilled holes in the dash for switches, but if you want to use them you'll have to continue the hole into the padding of the dash.
flick through thesamba.com for pictures of dashes, if you look at enough of them you'll spot a few with fresh air switches installed.
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