2006 ram 3500 5.9l. i have a strange noise when i firsst start truck, it make a noise in the front of the motor, when i check it out noise gets louder when you put your ear in front of the radiator. when you stick your head up above the the fan shroud noise is not as bad but after truck reaches a good engine temp noise goes away, not sure if this is normal, could it be the belt tensoner or idler pulley or even the water pump or belt, or maybe it is nothing at all, any reply's on this would be great