 Purchased the car with 53,000 miles from a dealer.  Within a month the transfer case was leaking which was replaced by the dealer.  At 78,000 had to replace the heads due to coolant disappearing.  At 82,000 unable to control the temperature, full blast heat.  To fix this problem the dashboard must be taken out to get to the heater box to replace the damaged part at a cost of $1,100.  The mechanic stated that this is a common problem with Ford Explorers. Terrible gas mileage; in town 14-15 mpg, highway 17-18 mpg.  Owned many Fords before, this one has been the worst.