No, they were not predicting an ice age.
What were climate scientists predicting in the 1970s?
The fact is that around 1970 there were 6 times as many scientists predicting a warming rather than a cooling planet.
Their papers showed that the growing amount of greenhouse gasses that humans were putting into the atmosphere would cause much greater warming - warming that would exert a much greater influence on global temperature than any possible natural or human-caused cooling effects.