Thump Sound When Blower On
08 X3 , MT - when warmed up and blower on I get a periodic ( every 3 seconds ) thump sound that seems to be coming from the rear of the engine compartment about where the blower fan would be - goes away when blower turned off.
anyone experience the same ? anyone have any thoughts on what might be causing the sound ?
thanks in advance to those who respond .
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