In a Prius 1.8L the head
In a Prius 1.8L the head gasket symptoms listed rarely occur, especially in the early stages when a head gasket alone can solve the issue. For advanced diy, a new head gasket with no hydrolock damage might be $500. The only sure sign in a Prius is the onset of severe cold start knocks and shakes. Not even an obvious coolant loss as the leak initially seals off with engine heat. I think it is important for internet bloggers like you and influencers like Scotty to point out that block sealers frequently clog up heaters, radiators, thermostats and magnetically coupled water pumps in our Prius engines. Given the fact that sealers rarely work for more than two or three months (assuming the leak was recognized early) the sealer has now added complications to the integrity of a subsequent hg repair. Maybe causing overheating conditions after a $2k-$5k head gasket repair. The downsides of sealer use for the owner were not highlighted in this article or the two referenced videos. Finally, we can expect more beginners to use these short term solutions to fool the next buyer. Unfortunately there are not obvious signs of sealers if the flipper is dedicated to hiding it.