Normal operating temp can range from 180 on the low side to 230 on the high side.
Standard operating temp is 190-195F. The GM factory application manual for the 6.5l diesel states the following:
Extended idle, >100 degrees F external ambient temp - 262F engine temp
City traffic operation - 118F external ambient - 255F
Grades - truck at GCVW, 7.2% grade, 100F ambient - 250F
Thermostat full open temp - 214F
Thermostat start to open temp - 190F
So - there's little risk of overheating your truck.
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1997.5 HMC4 Hummer H1 w/Slantback shell (Mine)
2006 Hummer H3 Adv. Package (Wife's)
M101A2 Trailer
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