NIARMADA Nissan Armada manuals & owner information
Nissan Armada owner resource

Manuals, service information and practical owner guidance.

Fast access to Nissan Armada owner manuals, service procedures, maintenance references, technical information and practical guides for different Armada generations.

Browse manuals →
Nissan Armada manual library

Nissan Armada 2025-2026 Service and Repair Manual: Reservoir Tank Cap

Nissan Armada 2025-2026 Service and Repair Manual / Engine / Engine Cooling System / Reservoir Tank Cap

Inspection

  • Check valve seat of reservoir tank cap.

    : Metal plunger

    • Check if valve seat is swollen to the extent that the edge of the metal plunger cannot be seen when watching it vertically from the top.

    • Check if valve seat has no soil and damage.

  • Pull negative-pressure valve to open it, and check that it close completely when released.

    • Check that there is no dirt or damage on the valve seat of reservoir tank cap negative-pressure valve.

    • Check that there are no unusualness in the opening and closing conditions of negative-pressure valve.

  • Check reservoir tank cap relief pressure.

    Standard and limit : Refer to RADIATOR : Service Data.

    • When connecting reservoir tank cap to the radiator cap tester (commercial service tool) and the radiator cap tester adapter (commercial service tool) (A), apply engine coolant to the cap seal surface.

  • Replace reservoir tank cap if there is an unusualness related to the above three.

CAUTION:

When installing reservoir tank cap, thoroughly wipe out the reservoir tank to remove any waxy residue or foreign material.

    Other materials

    Engine cooling system
    Basic information The engine cooling system of the Nissan Armada is factory-filled with a precisely balanced mixture consisting of 50% Genuine NISSAN Long Life Antifreeze/Coolant (blue) and 50% water. This formulation ensures reliable year-round protection against freezing, overheating, and c ...

    Diagnosis and Repair Work Flow
    Work Flow OVERALL SEQUENCE *1: Include 1st trip DTC. *2: Include 1st trip freeze frame data. DETAILED FLOWGET INFORMATION FOR SYMPTOM Get the detailed information from the customer about the symptom (the condition and the environment when the incident/malfunction occurred) using the “Diagno ...

    Diagnosis and Repair Work Flow
    Work Flow DETAILED FLOWINTERVIEW FROM THE CUSTOMER CAUTION: Customers are not professional. Never guess easily like “maybe the customer means that...,” or “ maybe the customer mentions this symptom”. >> GO TO 2. CHECK SYMPTOM Reproduce the symptom that is indicated by the customer, ...