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I would check the coolant level first. Then I'd replace the thermostat and radiator cap with OEM parts. At least this way several basic things can be ruled out immediately and it can't hurt to have new ones even if they are not the problem. The corresponding numbers of the Celsius guage are 80 and 120, with the unmarked line between the two being 100, I'm assuming.
- Peter.
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2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S
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