Welcome, you'd do well if you introduce yourself, that's the section you are in, your question would be better posted elsewhere, such as'general tech talk.' Let us know about you. You can do a search too, upper right of the screen. Another way things show up when a topic is brought up is at the bottom of the screen , just scroll down, I can see already that there are 5 threads there to review, that relate to your issue. I haven't done a coolant change and haven't reviewed the procedure so I can't be of any help to you. You'll find folks here to be a great help, they do expect you to play nice
Hoopla