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I blocked the upper grille, the slot between the upper grille and the bumper, and the two lower holes on my Canyon. I left open the hole under/behind the front license plate.
The engine temperature has been unchanged at 186 to 190 deg F at temperatures up to 90 deg F with the air conditioner running. The engine fan clutch has not engaged once.
I really have to make some plastic grille blocks (similar to the fog light covers) to replace that two year old temporary blue masking tape.
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