After driving for a while on a trip, there is a whooping sound that seems to come from the A/C in the back.It could be in the front, not sure. You can hear it inside the car. It does not happen unless you have been on the road for a while with the air on. The dealership is clueless. Any help out there? It sounds like whoop, whoop and then stops. I was told it may be the A/C fan berring wearing out.
 
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