I also had the high pitched noise on my ACE. I contacted Thor and they sent me the replacement grill no charge and i installed. My daughter and i drove to the beach for a weekend fishing trip and we still had the high pitched noise at about 65 mph. So, we stopped and purchased some masking tape and taped up the driver side window edge toward the front, the front windshield along the rubber down the driver side vertical and across the lower side rubber to the center of the wndshield. We drove down the interstate at 75 mph and no noise. We pulled off and removed tape jntil we found out the vertical rubber on the driver side of the windshield was where the noise was coming from. I will visit my windshield guy this week and let him do the correct repair, pretty sure camping world of concord nc does not have a guy who is remotely knowledgeable on windshields.
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