The water pump is normally driven off of the crankshaft,directly or via shaft thru the oil pump.
If you're having trouble burping or purging the air out of the cooling system, you may want to try putting the front wheel on set of car ramps or a couple steps up, this way the radiator is higher than the engine.As the engine gets up to operating range, rev the engine 3000-4000 rpms, in short bursts. you should have a lil catch pan underneath the radiator, so you can catch what spews out while reving .Best to leave the cap off while doing this and keep a close eye on the radiator level ,as it my drop suddenly, and have some coolant to add at the ready too.Usually if the fan has cucled 3-4 times ,you're good to go. At this time install cap and fill resevoir to proper level.
When the fan is running ,does the air it's pulling thru the radiator feel hot and the fan feels like its pulling good flow? If you have a garden hose(no high pressure), it might be a good idea to clean the radiator fins, both outside and inside, sometimes they do get full of road grime, dirt, bugs.
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