2011 Kizashi gts, head gasket done, 3 thermostats and 2 radiators later and several shop visits and still at square one without a resolution. I know the 2010's have had an inspection for block issues and since has started extended warranties, could this apply to later models as well? Thanks for any help.
Head gasket done...but, had the head and block mating surfaces been checked to specs for trueness during the process? If there's a problem w/ a warped head or block's deck (machined surfaces) a new gasket is perfume on a pig.
Has the water pump been replaced any time through all of your trials and tribulations?
What was the source (quality) of the replacement parts? OE or aftermarket 'stuff'.
As far as the block issue, call ASMC in Brea, CA and find out the VIN range that was affected. It's not out of the question an early build 2011 could be included.
Just a couple things that come to mind.