Well, it depends a bit on the possible failure scenarios. If we would be talking about a 10$ toy, hacking something together would totally be fine with me.
But we're talking about a 40k$ car and a system which is critical for cooling a part that is very eager to start a fire. I can easily imagine that the higher pressure or temperature tolerance would be needed if you're using the car in extremely hot weather (which can be a bit unexpected [0]) or when the battery experiences a critical failure. When working with systems that can have very bad failures, a bit of Ehrfurcht might be appropriate.
But we're talking about a 40k$ car and a system which is critical for cooling a part that is very eager to start a fire. I can easily imagine that the higher pressure or temperature tolerance would be needed if you're using the car in extremely hot weather (which can be a bit unexpected [0]) or when the battery experiences a critical failure. When working with systems that can have very bad failures, a bit of Ehrfurcht might be appropriate.
[0] https://www.theguardian.com/weather/2021/jul/08/weatherwatch...