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It is not particularly dangerous to drive a car with a blown head gasket other than the fact that eventually it is going to refuse to run. This is because there will be so much water vapor entering the cylinders that combustion will be impossible. Of course if you are driving a big ole eight banger, with only one cylinder blown, you can probably chug along forever, backfiring and spitting steam out the tail pipe and getting 3 miles to the gallon (very expensive).

With a four cylinder car (most of today's cars), water in a cylinder or two pretty much means walking to work until you get the gasket replaced.

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Q: How dangerous it is to drive your car if the head gasket is blown?
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Is it dangerous if you have a blown head gasket?

It is not wise to drive with a blown head gasket. If you continue driving with a blown gasket, eventually your car will over heat and the engine will seize up. This can cause accidents if it occurs while driving.


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