I have a 1987 MB 190E 2.3 that’s overheating at idle. It maintains a steady temp when driving. So, this tells me that the cooling system is working, somewhat. From the research I have done it has to do with a Cooling Fan. I’ve looked at the fan mounted on the engine and it spins freely. I’m not sure if it should do this (possibly and bad fan clutch?). Any suggestions? Just want to make sure I’m barking up the right tree before I drop some cash on a new part. I plan on fixing it myself.

Thanks