Pontiac Firebird

Coolant capacity & service interval

Pontiac Firebird coolant capacity ranges from 11,7 to 19,4 liters. The service interval for coolant is 24 months. The data covers 6 configurations.

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

TypeSpecifications
Firebird, SD-455 (1973-1974)
  • Use: Normal
  • Capacity 17 liter
  • Capacity 18 liter (+ airconditioning)
  • Change 24 months
Firebird, 455 cu. (1971-1976)
  • Use: Normal
  • Capacity 17 liter
  • Capacity 18 liter (+ airconditioning)
  • Change 24 months
Firebird, 455 H.O. (1971-1974)
  • Use: Normal
  • Capacity 17 liter
  • Capacity 18 liter (+ airconditioning)
  • Change 24 months
Firebird, 250 cu. (1970-1976)
  • Use: Normal
  • Capacity 11,7 liter
  • Change 24 months
Firebird, 350 cu. (1970-1979)
  • Use: Normal
  • Capacity 18,5 liter
  • Capacity 19,4 liter (+ airconditioning)
  • Change 24 months
Firebird, 400 cu. (1970-1979)
  • Use: Normal
  • Capacity 17,6 liter
  • Capacity 18,2 liter (+ airconditioning)
  • Change 24 months

Additional Notes

  • The Pontiac Firebird with the 250 cu. inline-six engine (1970-1976) carries an 11.7-liter cooling system capacity, the smallest figure across all listed engine configurations. A smaller displacement engine naturally requires less coolant volume to maintain operating temperature.
  • The 350 cu. engine (1970-1979) has the largest cooling system capacity in the lineup, at 18.5 liters standard and 19.4 liters when equipped with air conditioning. The air conditioning variant represents the highest single capacity value across all rows.
  • Air conditioning adds cooling load to the engine, which is why a larger coolant volume is specified for equipped vehicles. The 350 cu. engine shows the widest air conditioning-related capacity gap at 0.9 liters, compared to 0.6 liters for the 400 cu. and 1.0 liter for the 455 cu. and 455 H.O. engines.
  • The 400 cu. engine (1970-1979) holds 17.6 liters without air conditioning, rising to 18.2 liters with air conditioning. Despite its larger displacement compared to the 350 cu., the 400 cu. engine requires less coolant volume in both configurations.
  • The 455 H.O., 455 cu., and SD-455 variants all share identical cooling system capacities: 17 liters standard and 18 liters with air conditioning. The H.O. designation refers to a high-output tune, and the SD-455 was a Super Duty performance variant, yet neither required a different coolant volume than the standard 455 cu. engine.
  • The SD-455 was available only for 1973-1974, the shortest production span of any engine listed. The 455 H.O. covers a slightly wider window of 1971-1974, while the standard 455 cu. ran through 1976.
  • A 24-month coolant change interval applies uniformly across all six engine configurations under normal use conditions. A 24-month interval was a common industry standard for ethylene glycol-based antifreeze formulations of that era, which degraded in corrosion inhibitor effectiveness over time regardless of mileage.
  • The 250 cu. engine configuration ends in 1976, while the 350 cu. and 400 cu. configurations extend through 1979, reflecting the longer production run of those V8 engines in the Firebird range.

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