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howling noise

I have replaced nearly all parts of the engine in the last years. include cooling system, water pump etc. Last replace were the bearing of the rear wheels. we hear sometimes at a certain speed a howling noise, which come up and disapear again. It happens once, (standing and not driving) that I turned of the engine and it was heard 2-3 sec. after turning off the engine. So, I think it may by caused by the cooling system, expansion or pressure barrel vessel. any idea what could cause the noise ? the thermostat ?

reg. Uli

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