how is it possible for my fan to strike the radiator, this hapened twice. on 1994 Ford F-150

the fan hit the radiator of my truck on two occasions total ruin I had to replace 2 radiators and 2 water pumps.

Asked by for the 1994 Ford F-150
First we need to know what part failed, if it was the pump buy a better part and be damn sure to check the fan and fan clutch, may be unbalanced! Suggest replacing all three with 'NEW' parts!