Pontiac Montana (USA / CAN)

Coolant capacity & service interval

Pontiac Montana (USA / CAN) coolant capacity ranges from 9,1 to 12,2 liters. The service interval for coolant is 150000 miles. The data covers 4 configurations.

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

TypeSpecifications
Montana 3.9 SV6 E85 (CAN) (2007-2009)
  • Use: Normal
  • Capacity 10,2 liter
  • Capacity 11,6 liter (+ rear airconditioning)
  • Change 150000 miles
Montana 3.5 SV6 (2005-2006)
  • Use: Normal
  • Capacity 10,7 liter
  • Capacity 12,2 liter (+ rear airconditioning)
  • Change 150000 miles
Montana 3.9 SV6 (2005-2009)
  • Use: Normal
  • Capacity 10,2 liter
  • Capacity 11,6 liter (+ rear airconditioning)
  • Change 150000 miles
Montana 3.4 V6 (1997-2005)
  • Use: Normal
  • Capacity 9,1 liter
  • Capacity 11,3 liter (+ rear airconditioning)
  • Change 150000 miles

Additional Notes

  • The Pontiac Montana 3.4 V6 covering 1997-2005 carries a base cooling system capacity of 9.1 liters, which rises to 11.3 liters when the vehicle is equipped with rear air conditioning, reflecting the additional fluid volume required by the supplemental heating and cooling circuit.
  • The 3.5 SV6 variant from 2005-2006 holds the largest base cooling system capacity among all listed configurations at 10.7 liters, and with rear air conditioning installed, the total rises to 12.2 liters, the highest figure across all four engine variants.
  • Both the 3.9 SV6 (2005-2009) and the 3.9 SV6 E85 Canadian variant (2007-2009) share identical cooling system capacities of 10.2 liters standard and 11.6 liters with rear air conditioning, indicating no capacity difference between the standard and flex-fuel versions of the same engine displacement.
  • The rear air conditioning option adds between 1.4 and 2.2 liters of coolant capacity depending on the engine variant, with the 3.4 V6 showing the largest differential of 2.2 liters and the 3.9 SV6 configurations showing the smallest at 1.4 liters.
  • All four configurations share a uniform coolant change interval of 150,000 miles under normal use conditions, a figure consistent with long-life coolant formulations such as Dex-Cool, which General Motors introduced across its vehicle lines during the period covered by these specifications.
  • The 3.5 SV6 was produced only during 2005-2006, a notably short production window compared to the 3.4 V6 spanning 1997-2005 and the 3.9 SV6 beginning in 2005, placing the 3.5 SV6 as a transitional engine between the two longer-running displacements.
  • The Canadian-market 3.9 SV6 E85 variant is listed separately from the standard 3.9 SV6 despite sharing the same cooling system specifications, reflecting a market-specific designation rather than any difference in coolant capacity or service interval.

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