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I'd 1st suggest to pop the drive belt off and check the pulley and the rest of the pullies for stones stuck in a pulley groove
and also turn the new water pump( and the other ancillaries) by hand to check for tight spots
its also possibly trapped air in the cooling system
So check that the small hoses that run from the top of the engine and radiator that run back to the header / expansion tank are free flowing and not blocked
If these are OK then remove the tank pressure cap and run the engine from cold with the heater set to full hot
As the engine starts to warm, squeeze the large hoses running to the radiator to help displace any air - all the time keeping an eye on the level in the header tank, making sure it doesn't drop below the minimum and open any bleed screws built into the top cooling hoses - closing them off as soon as they start to gush water
Once the engine is up to temperature the tank should be quite full. Switch the engine off and leave it to cool
Then top up to the mark once its all cold and replace the cap
do you still need help?
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