Tldr,

Unmount everything

make sure the pump is below the radiator

shake the pump so all the air bubbles flow back into the radiator through the tubing

Reinstall and with the air bubbles gone, it should start spinning again

- - -

A lot tip videos claim shaking it will work but didn’t tell me *how* to shake it. I didn’t shake the pump in the right orientation (I put the radiator on the desk) so the air bubbles didn’t even go anywhere. I even tried shaking the radiator itself.

Send those air bubbles back to the demon realm

As Jake the Dog once said: “you’re shaking it all wrong!”

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