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Home >> Hummer >> 2008 >> H2 V8-6.2L >> Repair and Diagnosis >> Specifications >> Pressure, Vacuum and Temperature Specifications >> Thermostat, Engine Cooling
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Thermostat, Engine Cooling

The thermostat should begin to open 87°C (188°F)
The thermostat should be fully open 97°C (206°F).
Replace the coolant thermostat if it does not operate properly between this temperature range.
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