Hey Roan, you can try this site to get your grandfathers records:
http://www.archives.gov/veterans/
But they will probably tell you that they were lost in 1973 fire.
Do you know what type of unit he was in? (Signal, infantry, artilry?) Do you have any patches, insignia, pictures or documents of his? Even the smallest thing can lead to information.
My first post here was about the same as yours (looking for my grandfather). I have learned a lot since then, not neciseraly about my grandfather, but things that help me appreciate him and the bigger cause though.
I wish you LOTS of luck finding Info about him!!! Let me know if I can help!