Go to NHTSA to file a safety complaint.
Or call Monday-Friday (8 am to 8 pm ET) (888) 327-4236 TTY: (800)424-9153
The '92 ate cylinder heads and air conditioning compressors like candy. In the time I owned it, it had almost $10,000 in warranty repairs done to it. The '98 has been a little better. I've had no drive train issues but every component in the front end has been replaced at least once. The accessories are also unreliable. I'm on my 3rd rear windshield wiper motor. The power door locks stick all the time when it's cold. So far, I've "only" had about $3,000 in warranty claims.
On the positive side, I had excellent luck with the Firestone Death Radials that were on both trucks. I got well over 50,000 miles on both sets before replacing them. I don't live in Saudi Arabia so I didn't see the 130F temps that caused all the problems.
Anybody who has an Explorer they're planning to keep that's still under the original warranty really should consider buying a Ford extended warranty. There's a dealer in Iowa who sells Ford OEM warranties at a pretty good discount so you don't have to get the royal screwing from the "business manager" at your friendly local Ford Dealer. I used them and was totally happy.