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Pressure builds up in the radiator and is released at a preset range by the radiator cap. First replace the cap and if the problem persists replace the thermostat, if still no luck you may have a head gasket pressure leak, if so the problem will continue to get worse until it becomes undriveable.

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16y ago
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Q: Your 306 does not overheat but loses water from the overfill pipe after long journeys why?
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