SOURCE: keeps overheating and blowing white bellows of
White smoke is a sure sign of a blown head gasket.
Haven't you noticed the loss of coolant?
To be absolutely sure, you run a cooling system pressure test.
Basically you replace the radiator cap with a pump and gauge.
You pump it up over the cap rating, and watch for a few minutes to be sure it holds pressure.
A head gasket leak will usually not hold pressure.
Then you try it with the engine on.
When you rev it, that produces the maximum heat and pressure, so a leak will cause the gauge to oscillate every time the leaking cylinder fires.
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