With:
Good:
Fan Clutch
Correct coolant
properly serviced cooling system
fresh thermostat
operating temperature sensors
fresh surge tank cap (AKA radiator cap)

should be 80 to 84 degrees "C"

How ever if Ambients are over 100 degrees "F" And you're Freezing inside And
on an uphill grade with 800lbs in the trunk...op temps will climb.

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'84 300SD sold
124.128