haveing 1 bar pressure in the headertank after only 10mins driveing does defo sound like the beggining of headgasket
if you have bubbles in the expansion tank then that means the headertank cap is opening and that is rated to 1bar! you could try a 1.3bar cap but if it is headgasket it will make it fail alot quicker thou.if its headgasket it will slowly push water out the expansion bottle so keep an eye on the headertank water level
id take it back as scoobydoo suggests
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