Being originally from the Pacific Northwest I may not fully understand this accented discourse, but if I may make a stab at the problem. I am guesssing that you have a fan hitting a fan schroud.

How's that for a wild guess? Even though I don't speeka da language.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician