When you have case open, don't touch anything inside, and turn computer on, to see, if all fans are running.
Did you clean well inside with that compressed air (this is what I suspect, you have, not freon)?
Flame itself, means not much. It's SpeedFan's default setting - any temp above 50C will be marked with a flame, kind of warning.
But the number itself, 54C doesn't look good.