Maybe read these papers.So your opinion is the following.
The sun which radiates constantly the same amount of radiation has somehow caused the oceans to rapidly warm because it’s constant.
And then those same constantly warmed oceans distribute more warming to our planet.
Have I got your idiot position right.
Deep Atlantic Circulation During the Last Glacial Maximum and Deglaciation
https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/PA005i004p00469
Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes - Nature
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2010PA002032
How the ocean distributes heat can cause cooling through glaciation of the northern hemisphere even with constant sunshine being received. How else do you think bipolar glaciation began?
Today the currents are such that the planet is naturally warming and the NH is deglaciating. Been going on for 20,000 years. And will continue going on until heat transport from the Atlantic to the Arctic gets disrupted due to density changes which affect ocean currents. It's called the thermohaline circulation. Maybe look it up.