When I first bought my 83 300D last June or so it ran at a very steady 90C on the guage. This past winter it would occasionally get within about a needle's width of 100C. Usually turning the heat up would make it go down again. Today it started running a bit warm again, this time about a needle's width above 100C. Cranking the heat up all the way would drop it back down some. When I got home I let it idle in the driveway while popping the hood to have a look-see and the temp dropped back to normal, about 90C. Someone told me they heard a belt squealing when I started it up the other day at work. Anyway, some questions, the electric fan in the front, is that supposed to come on even if the A/C system doesn't work? What temp roughly should it come on at. Could a little belt slippage cause it to go up like this ? Maybe it slips a lot at higher engine speeds? I'm going to put in 4 new belts this weekend. No drop in fluid levels and no dripping anti freeze in the d'way. Can someone confirm for me that 100C isn't all that too hot for this engine? Regardless, it still runs well and hopefully it's just some maintenance being needed.