Hi All,

We brought the e53 in for cooling system refresh and the car came back with a very loud engine noise. It does not sound healthy at all. Mechanic says "he did not cause the sound".

The items that were replaced:
-Waterpump
-Thermostat
-Several hoses


Here's a link to a video of the sound- https://youtu.be/-n0Nc4DQXIE

Any ideas?