[aerohead]

I haven't experienced the locked clutch with the T-100,and it has only a 10-inch circular opening.I did cut the face of the bumper away,as it was directly in opposition to the center of the radiator.The upper and lower horizontal elements of the bumper remain, and probably act as a flow straightener.That may have made a difference,as the airflow,even though blocked,passes directly at the fan and clutch.----------------------------.P.S.,with respect to old vehicles,like my D-100 Dodge,I removed the mechanical fan completely and do run an all-electric pusher fan.