I've been wondering that myself, Experience with other volvos tells me that 2 gallons of coolant/distilled mix should be the capacity.

After getting it all back together, I poured in as much coolant as possible and ran it for an extended period - allowing the car to reach full temp and topping it off after massaging the upper and lower hoses.

The temp gauge on this car never goes above the 1/2 mark. So either it's never gotten too hot, or the gauge is broken...

I was surprised when I was only able to get 1 3/4 gallons into the system after reaching temperature. I was not too concerned when I topped it up on Tuesday, but after a week, I'd think that the air would have cycled out. I had no such issues with my 940 radiator replacement back in 2005.

I had to put another 1/2 gallon of distilled into the car this AM.

When leaving work, the car was fine, and then the low coolant light came on and then went off and stayed off. So I guess the pump is working.

I could smell some coolant as I drove and upon returning home, I could see the expansion tank was full to the brim (again) and some more residual leak around the cap. I could also detect some residual spray around the top of the timing belt case.

understanding the compression properties of air, I could understand that there might be a big bubble in the system, but if it hasn't worked out by now, how could I successfully clear it?