Suspension is too low or angles are out or both and the cab air is too high needs adjustment
It’s suspension related your air ride is too low
air leak on the fan hub itself or air leak between fan hub and selinoid? turn truck off take some water and spray it on the hose running from fan...
have your wastegate adjusted to 18.9 instead of 18.1 another thing i have done to mine is take a couple of 1/4 inch washers and put them between...
the air temp sensor should be in the center of the head on the drivers side two wire plug on it maybe three. if you are running your heater on...
i have had this problem before check you intake air temp sensor it will make your fan cut in and out .