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IF it is leaking you're not going to have high pressure. Coolant is under pressure so it does not boil, which make bubbles, bubbles do not transfer heat to radiator walls where it can be dissipated into the atmosphere. It's the same reason it takes water less time to boil at high altitudes: because there is less pressure.

Not necessarily, if combustion gas is pushing out water from the cooling system it will over heat at normal speeds even when idling.Check thermostat is opening ,radiator, pipes and waterways for blockage,air flow through radiator,fan/water pump belt tention and get a proper service /check over.To find out if the gasket is leaking air into cooling system, fill up by the radiator cap when cool,fill expandtion tank to line, make sure there are no other leaks,run and check again when cool,if the rad is full to the top and tank is on line your gasket is probably not the problem.

In my case, the combustion chamber could be leaked and filled with coolant water and then it turned out white smoke coming out from the exhaust. The coolant level will be lower in the result of overheating.

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โˆ™ 2015-07-17 17:31:13
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Q: Would a head gasket problem cause a car to overheat at high speeds?
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