What kind of cooling alarm? temperature high or low coolant level?
It could be that there is some air trapped.... normally it takes a little while to get all the air out of the system after a repair.
But that should only be a little bit of air.
Check if the hoses to the radiator get warm after warmed up, if so the pump should be ok.
Also before shutting the engine off unscrew the expansion vessel cap (carefully and just enough to let the pressure out)
screw it tight again and the cooling of the engine will shrink the air bubbles in the engine and pull more coolant in....
Rinse and repeat
Or use a brake bleeder on a cold engine on the expansion vessel to create some underpressure to gget the same effect
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