ANSWERS: 4
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Your water pump could be shot. Have it replaced.
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water pump failure.
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Sounds like a water pump to me. There is no way check it untill it is removed so you probably will have to replace it to know
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While the water pump is a STRONG possibility, I also must wonder about whether there is a big air bubble/pocket in the system. Depending on the design of the coolant passages in the block/head, it is possible that the (functional) water pump is fighting an insurmountable static head. Unlike liquids, air can compress. Pressure from the pump will compress that air bubble but NOT result in coolant flow.
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