Audi TT quattro - new coolant pump fault noise not working

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bought a new Bosch auxillery coolant pump and after installing, it is very noisy.

once i disconnected it, there was no coolant in it, meanIng it did not suck any through as it was dry.

this is a sound comparison with the original pump

Update video here... https://youtu.be/nHqqQDPKyWY?si=3PX8_PuYK6dtfiwt