Here's the catch... I have a 1999 Busa that would over heat while in stop and go traffic. Just finished installing a secondary fan, flushed out the remaining coolant and filled it up with engine ice. Now here's the problem, started up and let it run for a period of time. The needle stayed at half way all the time, but the overflow bottle level started rising almost to the point that it reached the opening. I have no clue what so ever of why would it be doing this
Oh, and of course the fan didn't turn on because the temp was reading half way but does work.