The miner observed that water/steam was coming out of the top of the Radiator from under the Radiator cap as well as the overflow on LHD Company #61. The Miner then placed his right hand on top of the cap to tighten it. The cap came off scalding the Miner's right/ left hand and right arm. The miner received 1st & 2nd degree burns to include restricted duty as of 01/10/2011.