Yes, normally the low speed fan should keep things in check. But with that, you can see 105 degrees.
I would try and clear all debris out from behind the fan motor. There most likely is quite a bit sitting in the "shadow" of the fan motor. That means no air is passing here.
How have you read your temperatures?
And how do you drive?. Coming off a highway and stopping in stop start traffic will mean a lot of pent up heat has to be released.
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