IMO=In My Opinion.

You're going to have to do your own googling. Atlantic British has a youtube channel that has all the applicable videos.

 

When you click on the discovery forum.. The first few threads are "stickies", they are stuck on the top of the thread list. One is a "how to thread", I believe it goes into detail about the issues with the shuttle valve.

Please please please do not trust the temp Guage in the cluster. It is a politician. . It tells you everything is fine while it's all going to pot. Get an ultraguage. So worth it. I have 2 now.