It you aren't totally replacing the fluid their would be a section under the owners manual, but provided you didn't loose that much coolant swapping the out the plastic piece you can simply add the missing coolant back via the coolant revivor. Just make sure you are using 50/50 premix coolant that is designed for aluminum engines and or specifically says designed for Nissan/Infiniti engines.

FSM can be found below if you need more details.

Infiniti Service Manuals

NICOclub.com purchases, downloads, and maintains a comprehensive directory of Infiniti Factory Service Manuals for use by our registered members. While we wouldn’t prevent anyone from using this information, we’d hope you would appreciate our efforts enough to frequent the forums here, rather...

www.nicoclub.com

 

It you aren't totally replacing the fluid their would be a section under the owners manual, but provided you didn't loose that much coolant swapping the out the plastic piece you can simply add the missing coolant back via the coolant revivor. Just make sure you are using 50/50 premix coolant that is designed for aluminum engines and or specifically says designed for Nissan/Infiniti engines.

FSM can be found below if you need more details.

Infiniti Service Manuals

NICOclub.com purchases, downloads, and maintains a comprehensive directory of Infiniti Factory Service Manuals for use by our registered members. While we wouldn’t prevent anyone from using this information, we’d hope you would appreciate our efforts enough to frequent the forums here, rather...

www.nicoclub.com

I did find the manual and followed it. Thank you