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Engines are designed to withstand a certain amount of stress. When you exceed that threshold, longevity will start to deteriorate. I stated something to that effect in this answer. The engine has a redline where you shouldn't take its speed past. This redline is not the maximum speed which the engine car run, but more correctly the threshold which you ...


You could be really lucky and it could be that the rubber seal within the cap has deteriorated and is no longer holding the pressure in the expansion tank. ** CAUTION ** - Do NOT remove this cap whilst the car is warm, you risk scalding from both super heated water and escaping steam. Once the car has cooled, remove this cap. If it appears to be loose ...


An 'end of its life' head gasket might cause the problem. But before that you be sure about the liquid- is it oil or water or whatever.

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