1997 Ford F350 Owner Guide 1st Printing - Page 278

4. Let the engine coolant drain into a suitable container. Disconnect the lower radiator hose at the radiator connector and drain any remaining engine coolant into a container. Reconnect the lower radiator hose and close the radiator drain cock. 5. Proper procedures for flushing the cooling system can be found in the Truck Service Manual. Engine coolant refill procedure After you have drained the engine cooling system: 1. Fill the radiator with a 50/50 mixture of the specified engine coolant concentrate and water. Allow several minutes for trapped air to escape (bubble out) and for engine coolant to flow through the radiator. Replace the radiator cap to its fully installed position, then back off to the first stop. This will prevent high pressure from building up in the cooling system during this part of the fill procedure. Start and idle the engine until the thermostat opens and the radiator upper hose becomes warm. Shut off the engine and allow the engine to cool. Cover the radiator cap with a thick cloth and cautiously remove it. Step back while the pressure releases. Finally, check the radiator and add more engine coolant if needed, following the procedures noted above. Reinstall the radiator cap securely, when finished. If more engine coolant is necessary, fill the overflow reservoir to the appropriate level marked on the bottle. 279 2. 3. 4. 5. 6.