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Glad to hear your looking for improvement and on a 2012 at that. Mine ended up covering about 200 sq. in, if I did that math right. Good luck with your grill, would like to see how that goes for you. Only took me about 2 hours if you dont include the waiting time for the Great Stuff to harden.
Yes DEFINITELY watch those coolant temps. I drove to work with mine (35 miles) with no hole in the block as a test. Got pretty warm at 50+mph, was happy to hit a red light. After work i cut a hole in because it was MUCH hotter (101F) in the afternoon. That worked well for a little bit, but i soon realized that i needed to make that larger. So i pulled over in a nice shady spot and cut the hole larger... Thank you drywall saw.
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