can you put an AC in a 2001 Chevy Express 3500 cargo van
Yes you can. There are businesses that sell everything you need to plumb and equip you vehicle for A/C. Try "Classic Auto Air" at 877.342.5526. They sell instillation and or repair kits for just about any make vehicle.
Search Chevrolet Express Cargo Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Chevrolet Express Cargo Experts