Q: overheating 120 minutes (or more) into vehicle operation signs of cyliner head crack?

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Out of the blue, after great period of service, sudden spikes of heat bleed off enough coolant to cause serious overheating while she's driving. I bring the car home and while I'm driving it the temp gauge is spiking to max even after shut off and coasting... first two thoughts are pump/stat failures, but the initial behavior is indicative of air in the cooling passages inside the cylinder head around the sensor. Is there a simple test possible to eliminate a cracked cylinder head without tearing apart the top end?

My car has 127000 miles.
My car has an automatic transmission.

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