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I have a 6 v 92 T and after driving the bus about 25 miles it tends to heat up to the 210 area. If you drive the bus 55 and don't push it, it will stay 180 to 190 as soon as you push it to 65 and hold it, it runs 210..........the radiator has been blown (externally) out and you feel the air flowing through it. I have changed the anti freeze and the old appeared very clean. It appeared to start happening with in about a two week period.
You mention the bus has just started to overheat. Did it ever overheat in the past?
I would start by checking to make sure both thermostats are workiing properly.
I would then make sure the fan is moving the air through the radiator properly. Make sure the radiator shroud is in place and the air it is moving is all going through the radiator. Any gaps will allow the fan to pull through the gaps rather than through the radiator.
Get an infrared laser thermometer so you know for sure what exactly the temps are. Check both sides of the block to make sure both sides are cooling the same amount. Check the radiator at the top and at the bottom. You need to have at least 20 degrees of differential. If you don't have at least 20 degrees difference your radiator is not cooling correctly.
Make sure your transmission is full up on fluid. Make sure the transmission is going fully into convertor lock up when you reach highway speed. Lack of fluid can cause the convertor to not lock up. Staying in convertor mode and not in lock up mode will cause a great increase in excess heat.
Check to make sure none of the hoses are collapsing as you reach cruising speed. The may appear to be fine at idle but the increase in volume when the engine is at WOT can cause old hoses to collapse. Collapsed hoses can greatly reduce the coolant flow.
Once you get all of the easy fixes done then you will need to start contemplating the hard fixes.
Maybe the radiator needs internal cleaning. My 870 ran hot when running the a/c and going over 55-60 mph. Of course I couldn't keep my foot out of it, too much fun. But waiting until it cooled enough to reset the overheat protector, and then idling cooled it down quickly and I was back on my way.
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