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With the cap off, sled running, are you seeing circulation of coolant? Is there a stream of coolant entering reservoir bottle? When you say full rebuild, what did you do? Did you drain block/motor from hose fitting off water pump outlet?
 

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You can try a Vacuum brake bleeder on it seal at the cap it will suck there air out of it make sure you have water pump Rotation ie The worm gear is not striped
That was going to be the next step if he confirmed no circulation into bottle. Sadly it is a common problem after rebuilds and need more emphasis from suppliers to consumers. Those gears need to mesh!
 
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