I seem to be building pressure in the system, temp dose not show hot but can here bubbling almost like boiling in the res tank after a drive, tank will be all the way full and upper hose and tank just seem to hot to the touch. Once cooled the coolant is back to normal range, have no leaks at all ,could I have a bad thermostat ? Need to add that this is on a 2006 V6 coupe, Auto .
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