Question about Jeep Cherokee

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I have a 2000 jeep cherokee sport. 195,000 miles. I have had to add coolant constantly the last 3 weeks(about 3 gallons). There is water on the passenger floorboard at times. now it is beginning to knock like the pistons are hitting loudly. the oil is full and dark colored so I didnt think it was leaking into the engine but Im not sure.

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First, we know the heater core is leaking due to coolant on the passenger floor. Second, the cylinder head could be or is most likely cracked around the valve seat, causing an entry for coolant to enter the engine. Third, the engine knocking is a real concern and may be related to overheating the engine. Is there white smoke coming from the exhaust? Is there blue smoke coming from the exhaust or a combination of both? Have you drained the oil to get a good reading of the oils condition? At this point, it seems there is internal engine damage from what I have read so far.

Posted on Mar 24, 2011


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