Hummer H3T (USA / CAN)

Coolant capacity & service interval

Hummer H3T (USA / CAN) coolant capacity is 9,5 liters. Service intervals include checks every 12500 km or 6 months and changes 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 H3T 3.7 and the H3T 5.3 V8 share an identical cooling system capacity of 9.5 liters, which represents the total volume of coolant the system holds during a standard service fill.
  • A 9.5-liter cooling system capacity is a moderately sized figure, consistent with the demands of a body-on-frame truck platform where longer coolant passages and a larger radiator contribute to overall system volume.
  • The coolant check interval for both engine configurations is set at every 12,500 km or 6 months under normal use conditions, whichever comes first.
  • The coolant change interval for both the 3.7 and 5.3 V8 engines is 240,000 km or 60 months under normal use conditions, reflecting the extended-life characteristics of modern OAT or HOAT-type coolant formulations typically specified for General Motors vehicles of the 2008-2010 era.
  • The 60-month change interval translates to a five-year service life for the coolant, meaning the fluid is expected to maintain its corrosion inhibitor effectiveness and freeze protection across that full period under normal use conditions.
  • Despite the significant displacement difference between the inline-five 3.7-liter and the V8 5.3-liter engines in the Hummer H3T, the cooling system capacity, check interval, and change interval are identical across both configurations for the 2008-2010 model years.

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