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What might be the possible reasons, in an XJ, for excessive coolant consumption aside from overheating and the coolant spilling out?
 

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Check your water pump and the head gasket areas it may also be a core plug/hose leaking.Pressurize the system it will tell you where it is coming from . If it is ahead gasket there is going to be white exhauast if into the chambers,if into an oil passage the oil in the block will look like a chocolate milk shake ,if into a coolant passage there will a black oil dots floating in the coolant.
HTH.
 
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