Hudson Hornet

Additional Notes

• The Hudson Hornet (1951-1954) carries a base coolant capacity of 17.8 liters, rising to 18.7 liters when the heater circuit is included in the fill.
• Adding a heater to the 1951-1954 Hornet accounts for a 0.9-liter increase over the base system capacity, reflecting the additional fluid volume held within the heater core and its connecting hoses.
• The Hornet 6 (1955-1957) lists a single capacity figure of 18.4 liters with no separate heater variant noted, whereas the Hornet 6 Twin H-Power of the same years specifies 17.5 liters base and 18.4 liters with heater, meaning the two six-cylinder configurations differ at the base level despite sharing the same heater-equipped figure.
• The Twin H-Power designation refers to a dual-carburetor induction setup on the inline-six engine, and the 1955-1957 Hornet 6 Twin H-Power base capacity of 17.5 liters sits 0.9 liters below the standard Hornet 6 base figure for the same years.
• The Hornet Special V8 (1955-1956) carries a base coolant capacity of 25.5 liters, the largest figure across all configurations in the specification set, with the heater-equipped variant reaching 26.5 liters.
• The V8 engine in the 1955-1956 Hornet Special demands roughly 7 to 8 liters more coolant than any of the six-cylinder configurations, a difference consistent with the greater displacement and additional cooling passages typical of V8 engine blocks.
• By 1957, the Hornet Special V8 capacity dropped sharply to 18.0 liters base and 18.9 liters with heater, a reduction of approximately 7.5 liters compared to the 1955-1956 V8 specification, indicating a change in the engine or cooling system architecture between those model years.
• All five configurations across 1951-1957 share a uniform service interval of a coolant check at 1,000 miles under normal use conditions, with no variation by engine type or model year.