With the heat we've been having, you have nothing to worry about w/ 100 to 105C, especially if you're in stop and go traffic.

If the "official" temp is 100, sitting in traffic has to be more like 110 or even 120F. If your car is running at 105C, I'd say don't chase a problem you don't have.

Then again, I have an M119 and trying to get her to run under 100 in summer is Mission Impossible.