One problem related to radiator has been reported for the 1998 Ford E-150. The most recently reported issues are listed below.
Driving down the highway I heard a popping sound, the truck stalled and the check engine light came on. The truck continued to stall. I called clark Ford after hearing about a spark plug problem with Ford trucks and they claimed to know nothing about it. I took my truck to my mechanic and the motor had to be replaced, this resulted in also a radiator split.