[What is this part?]

Further to my previous reply. I live in Queensland Australia where the avg daytime temp is mid 20 celcius in winter and high 20’s in Summer so I’m inclined to block the water passage rather than bypass it. Any thoughts?

[What is this part?]

Thanks to you both. I bypassed it and it’s back running like a dream but I’ve heard that if eliminated it can cause rising temps?

[What is this part?]

I think this is connected to the coolant bypass and seems to contain a spring. Could it regulate pressure?

 

https://www.amazon.com.au/clouddrive/share/rwswVE7EgA62Soc3jOMegJ0TGIW5MdRlvtAlHbAVYWF