Nissan X-Trail 2024 Owners Manual
10.5. Checking intercooler coolant level

Check the coolant level in the reservoir when the engine is cold. If the coolant level is below the MIN level (2), add coolant to the MAX level (1).
Tighten the cap securely after adding intercooler coolant.
If the intercooler cooling system frequently requires coolant, have it checked. It is recommended you visit a NISSAN dealer or qualified workshop for this service.
Owners Manual