Thank you for the replies.
I actually already have installed this loop, so I'm going to keep it, it's not a very big deal. But this loop just looks totally useless, so I was wondering if I could remove it to make a bit more room in the engine bay : these hoses are always in the way of something
TT, which one of the two systems you describe is the one that could be completely suppressed (blanking the in/out ports on the engine) without interfering with the global cooling of the engine, if there is one ? And do you know which one of them was the original set-up on the Sierra ?
Thank you.