This problem has plagued many 5th gen Explorers of all model years. I'd be very surprised if they issued a Recall. Recalls are for 'safety related' issues. I don't think a failed water pump would fall into that category.
Recalls are issued when an auto manufacturer or the NHTSA determines that a certain part of a vehicle poses an unreasonable safety risk and does not meet minimum safety standards. Once a recall is issued, manufacturers are required by law to provide a remedy for the issue. Repairing the issue (Most Common). Replacing a defective part.
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A TSB might be a more appropriate way to go but a TSB repair is only done without charge if the vehicle is under warranty.
Technical Service Bulletins (TSBs) are recommended steps and procedures for repairing vehicles. A TSB is issued by an automaker when there is a growing trend with an unanticipated problems.
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Peter