I too brought a jeep cherokee from a used dealership in 2008, it is a 2000 4l 6i also, same issues, the week after I brought the car the engine blew, the dealer would not cover it because they sent it to their mechanic shop and of course the mechanic shop said it wasn't the dealers fault, they told me that a rock hit the fan and put a small hole in the engine... I spent close to 1200 getting the engine rebuilt. Car ran for a little while then the check coolant light kept coming on, I had to keep a bottle of coolant...
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in my car and the coolant would run out every 2-3 weeks. Then in oct the engine blew again, my car is currently parked until I can find a low mileage engine to replace the old one. I do believe that this is a flaw in the design. Meanwhile I am still paying a car payment and having to work to get money to fix my car...Ughhhh. *Tr