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I saw the other responses, all good advice. I can add to it though. To the left of the radiator as you're facing it there is a cylindrical part with a switch, a couple of wires and two hoses going into it. Thats called a receiver dryer. If you start the car and turn on the air conditioning, then bridge the connection for those two wires, the compressor should engage. If it makes a horrible noise, its broke. If it works, I would check for leaks, then if ok I would convert to R134A. It costs about 6 bucks a can as opposed to 75.00 a pound. I've found that you can just add what is called 'Retro' oil to a new receiver dryer and to the compressor, evacuate the system and recharge it. This goes against prevailing dogma but there's a lot of guys doing it without any problems. I've converted lots of them for under $200.00. I've got a Volvo shop in Canby, Oregon called Mercy Motive. (www.mercymotive.com) Good luck, Chris Bogue P.S. You don't even have to remove the compressor. Just add the retro oil to it. I used to remove the compressor to drain the old oil out, but found that there was always only about a teaspoon or two remaining in them. The new oil is compatible so theres not a problem.
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