Can my radiator be set to cool my room?
Answers: depends... some building use the same radiators that they flow hot river in, within the winter for cool water within the summer and allowing cooling and heating... if however your conversation about your home system and it isn't a mega expensive spanking new system, then no you don't hold the right kind of radiator and setup to do cooling and heat only heat.
No, not unless you have middle air, and that have nothing to do near your radiator. Just buy a fan or nouns conditioner.