My experience (and a really usefull post in general)
http://www.volvoforums.org.uk/showth...=124622&page=4
I would definately advocate driving then draining a few times, i went through over 30L of ATF flushing using the gibbons method only to find that my ATF was brown again after a short drive due to mixing with what i hadn't got to in the Torque converter