Cadillac Series 75 (USA / CAN)

Coolant capacity & service interval

Cadillac Series 75 (USA / CAN) coolant capacity ranges from 18,2 to 22,5 liters. Service intervals include checks every 10000 km or 4 months and changes every 36000 km or 24 months. The data covers 6 configurations.

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

TypeSpecifications
Series 75 (1970-1974)
  • Use: Normal
  • Capacity 22,5 liter
  • Check 10000 km/ 4 months
  • Change 36000 km/ 24 months
Series 75 (1968-1969)
  • Use: Normal
  • Capacity 22,5 liter
  • Check 10000 km/ 4 months
  • Change 36000 km/ 24 months
Series 75 (1964-1967)
  • Use: Normal
  • Capacity 18,7 liter
  • Capacity 19,7 liter (+ airconditioning)
Series 75 (1961-1963)
  • Use: Normal
  • Capacity 18,2 liter
Series 75 (1959-1960)
  • Use: Normal
  • Capacity 20 liter
Series 75 (1957-1958)
  • Use: Normal
  • Capacity 18,8 liter

Additional Notes

  • The Cadillac Series 75 cooling system capacity rose from 18.8 liters in 1957-1958 to 20 liters in 1959-1960, then dropped to 18.2 liters for 1961-1963. A cooling system capacity reflects the total volume of coolant the engine, hoses, and radiator hold when fully filled during a service fill.
  • For 1964-1967, the Series 75 lists two distinct cooling system capacities: 18.7 liters for the base configuration and 19.7 liters for vehicles equipped with air conditioning. The additional liter accounts for the extra heat load that an air conditioning condenser places on the cooling circuit, requiring a slightly larger fluid volume.
  • Starting with the 1968-1969 model years, the Series 75 cooling system capacity increased to 22.5 liters, a notable jump from the 18.7-19.7 liter range of the preceding 1964-1967 period. The same 22.5-liter capacity carried forward unchanged through 1970-1974.
  • Service interval data appears only from 1968 onward. For both the 1968-1969 and 1970-1974 Series 75, the coolant check interval is specified at every 10,000 km or 4 months, whichever comes first under normal use conditions.
  • The coolant change interval for 1968-1969 and 1970-1974 is set at 36,000 km or 24 months under normal use conditions. A 24-month change interval was a common industry standard for ethylene glycol-based antifreeze of that era, as the corrosion inhibitors in the coolant degrade over roughly two years regardless of mileage.

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