As per previous posters, you'll need a belt on the compressor to find out if it'll work or not. It's a bit fiddly stretching a new belt on, I did mine a few weeks ago. There are some photos on post 19 of my thread here which show what's involved and the part number for the belt, I got mine from VolvoTradeParts on eBay along with an aux belt and tensioner.
https://www.volvoforums.org.uk/showt...=302878&page=2