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I wouldn't just outright dismiss it but I think if one does it they should monitor temps closely. It does make me nervous enough to not think about trying it. As noted, though, some bits might get hot and you won't necessarily see that on the coolant gauge.
My purposes for running grille blocks and blankets are to retain more heat while parked, and aid external pre-heating equipment like block heaters; I want faster warm-ups. I'm not interested in raising operating temps while it's running. There is still flow through my engine bays- albeit reduced- but I don't want to create any local hot spots.
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