I installed my grill block today. I have a Scangauge so I'm able to monitor my coolant temp. The car never went above 195 prior to the block and while sitting in traffic today it hit 207. If I remember correctly the radiator fan turns on at 212? So I'd assume anything under that is safe. Just wondering what you guys are getting? I did leave an opening for the radiator as you can see, it wouldn't be hard to make it bigger if need be.