Quote:
Originally Posted by MadisonMPG
Make another one, cover the entire grille/bow tie. It's winter, you shouldn't have any problems with overheating.
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From how it appears in the photo, you don't even have the entire grille blocked. I'd suggest you first remove it completely and see if there is any improvement. (I think it might be just coincidental about the performance. So I doubt this is cause and effect.) If there is no improvement, then it's an unrelated problem. You don't even have the whole grille blocked, let alone having a full radiator block. Usually, at worst, the fan will come on more often once it reaches 210+, but overheating is unlikely.
How many cylinders? Manual or automatic? How long does it usually take to warm up? Are you using a Scan Gauge?