I contacted Thor about the new grill material. Here is a copy of their reply
"The replacement grill you may purchase thru Total Value RV the sellout parts because Thor can’t sell retail there number is 866-282-4460 part number you need is 0313312."
Apparently they are no longer supplying this NC. I called Total RV and the price is about $100 plus freight. My grill is like extra heavy duty chicken wire so I think $100 is a bit out of line. Especially for a problem Thor and/or their grill supplier gave to me.
I decided to try covering my grill with screen as described by Ferf. Went out on Route 80 and drove about 10 miles at 70-75 miles per hour. The high pitched noise is no more. I will be taking a 2000 mile trip in January and am looking forward to the sounds of silence. Interested in how long the screen will hold up. I am taking an extra roll of screen just in case.
This forum and it's members have saved me countless hours of diagnosing problems and educated me on fixes.
Thank you all!
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