I have no idea what kind of bus you have.. but I found on my International that the doghouse area was a mess, the floor and doghouse weather stripping / seals needed alot of help .. i took it all apart and Hush-matted the whole firewall area, took apart and seam-sealed the areas of the floor layers (metal / plywood, then rubber) which had separated.. thet made a huge difference..
repairing the A/C if you have it involves troubleshooting it.. if there is cold air but very little air, then I take looking for clogged up duct work, rodent nests, dirt on the inside and outside coils, inside fan motors.. etc..
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