I have a Q45 w/ a V8. The front thempostat opens at 185. The rear at 210.
My scangauge will sit at 195 at idle or park. (even after 20 minutes) while driving it runs from 197 to 213 with it being over 200 most of the time while driving.
According to my Field Service Manual, my 'temp light' is triggered at 230. So 'technically' I'm ok at 229.
with that said, I tend to really pay attention when I get to 220. Especially if the driving conditions will stay the same for more that 30 more minutes. Like driving thru a desert area. Or being in stop n go traffic jam.
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