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Originally Posted by 81Wagon
Not reading closely enough it seems. It is 80-90 C in normal driving. It is not running cooler in normal conditions. I'm talking about driving up a steep grade at full throttle for four to six minutes - it ALWAYS has gotten hotter in that situation and that, too, is normal. But it all of a sudden isn't doing that anymore, which I find kind of unusual...
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Mine runs 80C on average driving, 4% grade or higher runs 95C.
Baker grade or Grape vine
The first thing anyone should do in a case like yours; replace the thermostat, this is common sense step one.
Cooling system flush will not hurt.
Replace radiator relief cap, cheap insurance.
Check water pump belt tension.
Check water pump flow.
My best guess:
Your thermostat is bad..
The thermostat has not been opening fully before; it has now failed in the full open position.