Abstract: A tool useful in facilitating the safe twist-off of an automotive radiator cap. The novel tool comprises a wrench element having an elongated handle with a radiator cap receiving socket at the lower end of the handle, and a shield element having a tubular grip with a hood skirt affixed at the lower end of the grip tube. The shield element is open at both its ends and the elongated wrench handle is both rotatable and axially slideable within the shield grip. In an operative assembled condition of the tool the wrench element is axially inserted into the shield element so as to shroud the cap wrench socket within the hood for deflecting hot liquid or stem ejected from a radiator, the hot fluid being diverted by the hood away from the person operating the tool.