There are a few possible causes for radiator fluid leaking from the reservoir.
- The radiator cap may not be secured properly and needs to be tightened.
- The O-ring seal may need to be replaced, or there could be an issue with the temperature control valve.
- It's also possible that there is a crack in either the hose or the reservoir itself, allowing fluid to escape.
In any case, it's important to identify and fix the source of the leak as soon as possible before more serious damage occurs.