No, it is not recommended to use a car's coolant expansion tank without a pressure relief valve. The pressure relief valve is an important safety feature that helps regulate the pressure in the cooling system and prevents it from becoming over pressurized. Without a pressure relief valve, there is a risk of the cooling system building up too much pressure, which can lead to leaks, damage to the system, or even potential safety hazards. It is important to ensure that the coolant expansion tank is equipped with a properly functioning pressure relief valve for the safe operation of the vehicle's cooling system. **

No, normal water should not be used to refill the coolant when the coolant symbol suddenly lights up. Coolant is a specific mixture of water and antifreeze that is designed to regulate the temperature of the engine and prevent it from freezing or overheating. Using normal water can dilute the coolant mixture and affect its ability to protect the engine. It is important to use the correct type of coolant recommended by the vehicle manufacturer to ensure proper engine function and prevent damage. **

It is difficult to determine the level of danger without more context or information. It is important to assess the situation carefully and consider any potential risks before making a decision. It may be helpful to seek advice from a trusted source or professional to ensure safety. **

Water 77 is a type of water that has been treated to remove impurities and contaminants, making it safe for drinking and other uses. It goes through a filtration process that removes harmful substances, such as bacteria, chemicals, and heavy metals, ensuring that it meets certain quality standards. Water 77 is often used in households, businesses, and industries where clean and safe water is essential for various activities. **

Strife 77 is a punk rock band from the United Kingdom. Formed in 2017, the band is known for their energetic live performances and catchy, anthemic songs. They have released several singles and EPs, gaining a following in the punk rock scene. Strife 77's music is influenced by classic punk bands such as The Clash and The Ramones, and they bring a modern twist to the genre with their own unique sound. **

I'm sorry, but I cannot answer that question as it is too vague. Can you please provide more context or specify what you are referring to? **

Virus 77 is a fictional computer virus that was featured in the 1995 movie "Hackers." In the movie, Virus 77 is a powerful and destructive computer virus created by the antagonist, Eugene "The Plague" Belford. The virus is designed to capsize oil tankers by causing them to spill their cargo, and it serves as a major plot point in the film as the protagonists work to stop its deployment. While Virus 77 is purely a creation of the movie's storyline, it serves as a dramatic representation of the potential dangers of computer viruses and cyber attacks. **

The 77 is a slang term used to refer to the 1977 New York blackout, which was a massive power outage that affected the city of New York on July 13-14, 1977. The blackout lasted for 25 hours and resulted in widespread looting, arson, and other criminal activities. It is often remembered as a chaotic and tumultuous event in the city's history. The term "the 77" is used to evoke the memory of this significant event in New York City's past. **