 Purchased a 2006 Ford Explorer used in 2014. Clean car fax, no issues. 1 month after the purchase the water pump went out. No problem, replaced it and moved on. Two months later the thermostat went out. Had that replaced. A month later the radiator sprung a leak. Second radiator this car had replaced based on car fax history report. Then the heater hose blew, twice in 6 months. After all of that the car still would  overheat at any given time. Then about one year after the purchase, the transmission would not engage in reverse all the time. Had to shut the engine down and try it again until it would engage. Two many other issues to list, but finally the straw that broke the camels back was a broken timing chain. Apparently when the timing chain breaks in this engine, you are looking at serious money to repair. Or a possibly replacing the engine. Had this auto for three years, put about 18k miles on it and had it towed to a mechanic at least five times. Never again. Sold it for what I could get.