Hummer H3T (USA / CAN)

Coolant capacity & service interval

Hummer H3T (USA / CAN) coolant capacity is 9,5 liter. Service intervals include checking every 12500 km or 6 months and changing every 240000 km or 60 months. The data covers 2 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
H3T 3.7 (2008-2010)
  • Use: Normal
  • Capacity 9,5 liter
  • Check 12500 km/ 6 months
  • Change 240000 km/ 60 months
H3T 5.3 V8 (2008-2010)
  • Use: Normal
  • Capacity 9,5 liter
  • Check 12500 km/ 6 months
  • Change 240000 km/ 60 months

Additional Notes

  • Both the 3.7-liter inline-five and the 5.3 V8 share an identical cooling system capacity of 9.5 liters, which represents the total system fill volume including the engine block, radiator, and associated hoses rather than a partial or top-off quantity.
  • The Hummer H3T (USA/CAN) coolant check interval is set at every 12,500 km or 6 months, whichever comes first, under normal use conditions.
  • A coolant change interval of 240,000 km or 60 months applies to both engine configurations under normal use, placing the H3T among vehicles with extended-life coolant service schedules.
  • The 60-month change interval corresponds to a five-year cycle, which is consistent with the behavior of modern extended-life coolant formulations that maintain corrosion inhibitor effectiveness over long periods before degrading.
  • Despite the significant displacement difference between the 3.7-liter five-cylinder and the 5.3-liter V8, the cooling system capacity remains at 9.5 liters across both engine options for the 2008-2010 model years.

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