Pooler12345

Hello, New to the forum I am helping my neighbor determine a noise issue with his pump (as the pump borders our fence)... he had his pool redone and they installed a new 1.5HP Hayward (I think its a Hayward Super pump II) and out of the box its makes a constant whirl sound (not a screeching bearing sound)... I read that these pumps have an internal cooling fan.. Hayward's own installation manual says to not mount these near a window due to the fan noise...When the pump first turns on and water begins to flow the motor sounds very quiet.. after about 15 seconds I hear the whirl (its constant - almost sounds like a turbine from distant power plant (for lack of a better description)). I assume at startup there is no load, when water is fully flowing the motor is under full load and the whirl sound starts. . is this sound typical for these pumps?...does this sound like the internal cooling fan?... is it load related? ... is it normal? ....any feedback would be appreciated thx