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Unexplained coolant loss. Cyl. pressures good don't thing it is head gasket. No visible leaks. Goes thru resovoir daily.

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Pressurize system, only two places for fluid to go, inside engine or outside, if its not leaking outside engine when pressurized, that answers your question,head gasket leaking at full temperature, heat equals expansion, it will get worse before it gets better. if you decide to have it fixed make sure you have head set to machine shop for pressure test and warped test and repair or it will leak in a month or so, it only takes one overheating to warp a head

Posted on Jan 02, 2011

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If there isn't a puddle of coolant forming on the driveway after the car sits for awhile and there isn't a puddle inside the passenger compartment, then the problem must lie in the cylinder head or engine block.

Posted on Jan 02, 2011

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Sounds to me like the head gasket could be leaking not to the ground, but to the cylinder. Is there white smoke at any time indicating water/coolant is making its way to the cylinder? If so, then the head gasket does have a leak. Maybe try some head gasket repair for $30 from Bar's Leaks at Advance Auto or Autozone to try to seal it without removing the head. If that doesn't work, then a new head gasket may be the solution for this case.

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