If your engine temp is staying above normal, you may have a dirty CAC (charge air cooler).
It is located between the cooling fan and the radiator and is best cleaned by applying cleaning solution from inside the fan shroud.
Some use a solution of Dawn dishwashing detergent or Simple Green (Aircraft) cleaner (save on aluminum) via a pump garden spray applicator and saturate it several times to dissolve the grease and grime inside the grill.
You need a strong flashlight
and mechanics extension mirror to see inside and make certain you get in the corner areas real good.
You may have to repeat the process several times to get it clean.
Please let us know how you make out if that, or something else, turns out to be the issue.