man says that if the warm golf stream is cancel, then Finland freezes overnight

Finland is warmer than it should be in comparison to how north it actually is

This is because warm sea water from southern parts of USA goes all the way to Finland in a underwater stream which is not sufficiently cooled down by cold air, air is not enough to negate its effect

this has been goin on for 9000 years now
but what happens if for some reason it stops?

https://tekniikanmaailma.fi/skandinaviaan-jopa-50-c-pakkasia-tutkijat-mallinsivat-mita-tapahtuu-jos-atlantin-termohaliinikierto-pysahtyy/

they said Edinburgh, UK would start to see -33 degrees celcius during winter and London would fall to -19 degrees

Germany is likely comparable to England temperatres but its Ireland and England who are freshly hit by Golf stream all the time, Germany is farther

In Stockholm Sweden and Helsinki Finland we would start to see -50 degrees during winters, the normal for central Russia around same elevation

Golf stream does not effect summers however, they would be the same +15 to +30 degrees heat in Sweden and Finland, summers are short and usually have maximum of 4 weeks record warmth and rest of the 8 summer weeks stay on colder side, regardless of any Golf streams