Yea, he kept passing out coz of the heat in the suit.
Also wasn't happy his face wouldn't be seen. Was supposedly fired but there's varying reasons as to why and told he'd never work in Hollywood again. Then he went and bagged a 5mil 3 picture deal.
Here he is in the original suit.
van Damme was the first Predator. He simply did not like the original ( red) Predator costume.