* Specific model of F100: Different body styles (pickup, camper special, etc.) and options (like air conditioning) could slightly alter the cooling system size.
* Engine configuration: While you specified the 390 cubic inch engine, variations in the specific configuration (e.g., optional heavy-duty cooling package) could impact capacity.
* Condition of the system: Over time, corrosion and sediment buildup can reduce the actual usable capacity.
To find the correct capacity:
1. Consult your owner's manual: This is the best source. If you don't have the original, try searching online for a PDF version specific to your truck's details (year, model, engine).
2. Check the radiator: Look for markings on the radiator itself (often stamped near a seam or filler neck). This might give a partial capacity.
3. Check the overflow tank: The overflow reservoir can hold additional coolant, and its capacity should also be noted.
4. Consult a Ford parts dealer or mechanic: They might have access to service manuals that provide the information.
Without more specific information about your truck, providing a precise number would be unreliable and potentially inaccurate. Attempting to fill based on a guess could lead to an overfilled system, potentially damaging your engine. Always refer to official documentation.
