The rear washer sprayer takes washer fluid from the resivoir in the engine compartment. It could take a bit for fluid to travel the length of the X, but if it is dripping then the line is either plugged or the sprayer is plugged. The dealer should be able to fix this problem, just make sure they put it back together the right way.
I had my X in for hail damage repair (on the roof), and Ford's "collission center" forgot to hook up the rear washer line when they put the headliner back in. Needless to say, when I used the rear sprayer, I heard liquid pooring into the rear cargo mat and my rear window wasn't getting clean. Thank goodness for the floor mat, otherwise I would have had some stained carpet.
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-Eric
2000 Excursion Limited, PSD, black, fully loaded, Western Diesel chip, Viper 550 alarm w/ remote start, Alpine CVA-1005 6.5" head unit, Alpine DVA-5200 DVD player, Alpine CHA-1214 12-disc CD changer, Alpine MRV-T757 2-channel amp, Alpine MRV-F407 4-channel amp, 2 Alpine Type-R series subs (SWR-1040D), subs mounted in rear cargo doors, 21% tint all around
[This message has been edited by erlong (edited 02-03-2001).]