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Q: what causes the motor to overheat on 1999 Cadillac DeVille

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
on the freeway cruising 62mph, the car runs fine, however when I slow down the all hell breaks loose and the car overheats. In the the city, the car overheats after 30 minutes driving.
(2) Answers
Best guess : radiator cooling fans are not working. Ram air at speed will cool rad. but at slower speed fans have to do it.