[40k Later]

If you can touch the radiator that would indicate no hot engine coolant has entered and therefore I would say you have a "Bubble" or trapped air. Run it with the cap off until it burps. If that doesn't work have someone rev it up slowly with the cap off and see if the flow increases. That will tell you if your bottom hose has collapsed. If after you rev it, flow slows, your bottom hose is tango uniform.

I'm thinking air is trapped and not a fan issue. Please let us know what you find