Yes, opening the radiator cap while the engine is hot can be dangerous as it can release hot steam and coolant under pressure, potentially causing burns. Additionally, removing the radiator cap can disrupt the cooling system's pressure balance and lead to coolant leakage. It is recommended to wait until the engine has cooled down before opening the radiator cap to avoid any potential damage or injury. **

You will need a new cartridge that is compatible with the Dual 721 turntable. The original cartridge for the Dual 721 is the Shure M75-6, but since it may be difficult to find a new one, you can consider a suitable replacement such as the Audio-Technica AT95E or Ortofon 2M Red. These cartridges are known for their compatibility with the Dual 721 and will provide good sound quality for your turntable. Be sure to check the compatibility and installation instructions before purchasing a new cartridge for your Dual 721 turntable. **

Playing against a grandmaster in chess can be an incredibly challenging and intimidating experience. Grandmasters are among the best players in the world, with a deep understanding of the game and exceptional strategic skills. It is important to approach the game with humility and a willingness to learn, as playing against a grandmaster can provide valuable insights and opportunities for improvement. While the odds of winning may be slim, the experience of facing off against a grandmaster can be a valuable learning opportunity and a memorable experience for any chess enthusiast. **

A ribbed radiator typically heats better than a flat panel radiator. The ribbed design increases the surface area of the radiator, allowing for more efficient heat transfer. This means that a ribbed radiator can heat a room more quickly and effectively than a flat panel radiator. Additionally, the ribbed design allows for better circulation of air, further enhancing its heating capabilities. **

Becoming a chess grandmaster is a highly challenging and competitive endeavor that requires exceptional skill, dedication, and strategic thinking. While it is theoretically possible for anyone to become a grandmaster with enough practice and commitment, the reality is that only a very small percentage of chess players ever achieve this prestigious title. To become a grandmaster, one must typically start playing chess at a young age, receive expert coaching, participate in numerous tournaments, and consistently perform at a high level against top competition. It is important to set realistic goals and enjoy the journey of improving your chess skills, regardless of whether or not you ultimately reach the grandmaster level. **

In general, the size of a radiator does not necessarily determine its strength. The strength of a radiator is typically determined by factors such as the material it is made of, the design of the fins and tubes, and the quality of the pump. Therefore, a 420mm radiator may not necessarily be stronger than a 480mm radiator. It is important to consider the specific specifications and performance metrics of each radiator to determine which one is stronger for your particular cooling needs. **

Yes, it was bad that steam was escaping from the radiator cap when the engine was still hot. This could indicate that the cooling system is not functioning properly, which can lead to overheating and potential damage to the engine. It is important to address this issue promptly to prevent further damage and ensure the safe operation of the vehicle. **

That blue cover with an H in the engine compartment is likely the engine cover. It is designed to protect the engine and its components from debris and dust. It also helps to reduce engine noise and improve the overall appearance of the engine bay. The H may be the logo of the car manufacturer or the specific model of the vehicle. **