I believe all of the wagons have two separate pumps, acessed from underneath, in front of the right wheel, with the splash guard off. Did both front and rear quit exactly at the same time? I am not aware of any common elements between the two systems. The front windshield washer flow usually gets blocked first at the top-hat T junction under the hood and back by the hood spray nozzles. There is also a small clear plastic canister (filter) in the line near the pump that clogs. Usually you can trace the flow of water by first disconnecting hose at the pump itself and insuring that water is pumped out from pump itself - if not, and you have current at pump, then problem in pump. If pump can push the water, then disconnect at each junction up to window washer nozzles and there must be a block at one of those. windshield and headlight washers work together, from same pump, and those usually plus at the junctin T connector hidden behind teh right headlight assembly. The rear has a separate lump located in front with teh other, on side of resevoir. The rear usually plugs at a clear plastic filter that is located under right rear floor panel, and next bet is the one-way valve that is in the line up behind the right rear D-pillar where teh speaker opening is, and near the upper taillight assembly. Remember that in all the checks for plugging, the pump itself must be able to pump water, so that is first check for both front and back.
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Mike Sullivan '07 XC70, '95 855T (100k), '95 855 NA (148k). Past Volvo's: '85 744 (256k), '86 245 (165k), '86 245 (195k), '88 745 (208k), '91 745 (196k), '93 965 (147k) , '98 V70XC (98k).