Since no one else mentioned it - there is a separate drain for the coolant in teh engine block. If you don't drain from here also, you only get about half the coolant out. If you slide under car (on ramps, etc) go under where the oil drain plug is and look higher up on the passenger side of the block and you will see a typical block drain. Just loosen that and put a pan under it. Have heater controls set to high temps as well to be sure the heater core is open and drains.
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Mike Sullivan ('91 745 (184k), '95 855T (70k), '98 V70XC (83k). Past Volvo's: '85 744 (256k), '86 245 (165k), '86 245 (195k), '88 745 (208k), '93 965 (147k) .