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my 1997 960 wagon had a leaking sunroof, and it was a nightmare to fix.
My car came from Texas where it is very hot (plus my car is black, black=heat magnet) and was brought to Washington where I bought it and now it is in Oregon. The heat in places like Texas and California is very very hard on rubber and plastic parts. The sunroof seal around the glass is dust/wind/water resistant. The seal on my car had shrunk so badly from the heat that it was letting in Tons of water. My car was wetter on the inside than on the outside. I cleared the sunroof drains with compressed air and replaced the seal. That job is very easy, the sunroof glass is only held on by 4 bolts and the new seal comes longer and needs to be trimmed to size. I reccomend that you put the seal in the sun before working with it to heat it up and make it more plyable, use 3m black weatherstrip adheasive in the strip channel to seal it to the glass so water does not go under the seal instead of around it and dont cut the seal too short. Also use the 3m stuff along where the seal meets together, I had an interesing whistling noise coming from that area at 70 mph before I did that. Hopefully that will solve the leak. But, if your car was in high heat like mine here is what could have happened. After I replaced the seal the leak got better, but not fixed. my car was still getting wet inside. This time I got pissed and tore the car apart, the headliner was going to get damaged if I couldn't get rid of this leak. I took down the entire headliner in my wagon (bitch of a job because plastic clips get brittle from heat so you end up replacing lots of expensive little clips that break even if you are careful) I found that there is a plastic drip tray mounted under the sunroof, it has a water channels that directs water to hoses that run to the drains and out of the car. There are 3 rubber seals. One on each side and one in the rear. They seal against the roof to keep water from overflowing the water channels when you are driving. (I replaced these also because of heat shrink) But I found the main problem was not the seals but the plastic drip tray itself. The tray is not one contiuous piece of plastic, but several pieces that are stuck together with some sort of crappy adheasive that doesn't like high heat. Anyway, so when the water gets to these seams in the channels where the adheasive had shrunk, the water was flowing into the seams, bypassing the drains and leaking onto the headliner. So, once again I busted out the 3m weatherstrip adheasive and went to town and put that stuff on the inside and outside of every seam in that whole tray if it was leaking or not. I figured if it wasn't leaking now, it would be later and I never want to take the headliner down again so I better do it all now. Im happy to say that finally solved the problem (months and lots of $ later) and now my Volvos live in a garage where they are safe from both heat and water.
Hope this helps
ELM
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