One problem related to defogger has been reported for the 1998 Mercury Sable. The most recently reported issues are listed below.
Front windshield would fogged up first, and then unfogged when using defogger, which could lead to a vehicle crash due to poor visibility. Dealer notified, and informed consumer that this was a normal concern, but unable to correct the problem at this time. Please feel free to provide any further details on this matter.