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From: I live my life by 2 rules. 1) Never share everything you know. 2)
St. Jude Donor '11-'12-'13, '16-'17-'18
Cliff notes: The mechanical temp gauge is NOT showing 220. It's showing around 205. The 220 marking on the gauge face is very misleading.
If I really want to know the correct temp, I use the gauge in Perf. And my C7 (Z51, M7) has never gone above 212 and that was in 95+ outside temps and under load. At idle, even in hot outside temps, it never goes above 205.
Cliff notes: The mechanical temp gauge is NOT showing 220. It's showing around 205. The 220 marking on the gauge face is very misleading.
If I really want to know the correct temp, I use the gauge in Perf. And my C7 (Z51, M7) has never gone above 212 and that was in 95+ outside temps and under load. At idle, even in hot outside temps, it never goes above 205.
I use the same guage, but you need to add an addt'l 5-7 deg for those of us in the "hot country".....