1. Park the motorcycle on a level surface and allow the engine to cool down completely.
2. Locate the coolant reservoir. On the 750 Vulcan, it is a clear plastic tank located on the right side of the motorcycle, just behind the cylinder head.
3. Check the coolant level. The coolant level should be between the "FULL" and "LOW" marks on the reservoir.
4. If the coolant level is low, add coolant until it reaches the "FULL" mark. Use a 50/50 mixture of antifreeze and water.
5. Replace the coolant reservoir cap and start the motorcycle. Let it run for a few minutes to circulate the coolant.
6. Check the coolant level again and make sure it is still between the "FULL" and "LOW" marks.
It is important to check the coolant level regularly, especially before long trips or in hot weather. Low coolant levels can lead to overheating and engine damage.