Abstract: A temperature indicating cap assembly includes a radiator cap that is removably attached to a fill neck on a radiator. A temperature indicator is coupled to the radiator cap. The temperature indicator is in thermal communication with the radiator when the radiator cap is removably coupled to the radiator. The temperature indicator indicates a safe temperature, a caution temperature and a danger temperature. In this way the temperature indicator communicates when the radiator cap may be safely removed from the radiator. A lock is coupled to the radiator cap and the lock is comprised of a thermally reactive material. Moreover, the lock engage the fill neck when the temperature of the radiator is above the caution temperature.

Abstract: A temperature indicating cap assembly includes a radiator cap that is removably attached to a fill neck on a radiator. A temperature indicator is coupled to the radiator cap. The temperature indicator is in thermal communication with the radiator when the radiator cap is removably coupled to the radiator. The temperature indicator indicates a safe temperature, a caution temperature and a danger temperature. In this way the temperature indicator communicates when the radiator cap may be safely removed from the radiator. A lock is coupled to the radiator cap and the lock is comprised of a thermally reactive material. Moreover, the lock engage the fill neck when the temperature of the radiator is above the caution temperature.