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Coolant flush for 2017 Nissan Pathfinder - Recommended type?

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Mike T. · rep 0 · May 25, 1:56 AM · 1 replies · solved · Question

Vehicle: 2017 Nissan Pathfinder SL

My 2017 Nissan Pathfinder SL is hitting 75,000 miles, and I'm starting to think about doing a coolant flush. I've heard that using the wrong type of coolant can cause problems, especially with modern engines. I want to make sure I use the right type and follow the correct procedure.

Has anyone done this DIY on a Pathfinder of this generation? Any tips on thoroughly draining the old coolant and refilling to avoid air pockets in the system? I want to make sure I do this right to prevent any overheating issues down the road.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:56 AM

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Performing a coolant flush on your 2017 Nissan Pathfinder at 75,000 miles is excellent preventative maintenance. Using the correct coolant and proper procedure is vital for your engine's health.

Here's a guide to help you:

  1. Coolant Type: Your 2017 Nissan Pathfinder requires Nissan Long Life Antifreeze/Coolant (often identified by its blue color). This is a P-OAT (Phosphated Organic Acid Technology) coolant. Do NOT mix it with other coolant types (like green, red, or orange OAT/HOAT coolants), as this can lead to chemical reactions, gelling, and severe damage to your cooling system components.
  2. DIY Procedure:
    • Safety First: Ensure the engine is completely cool before starting. Wear gloves and eye protection. Coolant is toxic.
    • Drain: Locate the radiator drain plug (petcock) at the bottom of the radiator. Place a large drain pan underneath. Open the drain plug and remove the radiator cap to allow for full drainage. For a more complete drain, you may also need to disconnect a lower radiator hose.
    • Flush (Optional but Recommended): Once drained, close the drain and refill with distilled water. Run the engine with the heater on high until it reaches operating temperature (thermostat opens). Drain again. Repeat this process until the drained water runs clear. This removes more old coolant and contaminants.
    • Refill: Close the drain plug. Refill the system slowly with a 50/50 mixture of Nissan Long Life Coolant and distilled water. Use a spill-free funnel to help prevent air pockets.
    • Burping the System: This is critical. Start the engine with the radiator cap off (or funnel in place). Let it warm up, squeezing the upper and lower radiator hoses periodically to help dislodge air bubbles. Run the heater on high. Watch for bubbles coming out of the radiator neck. Continue until no more bubbles appear and the fluid level stabilizes. Top off as needed. Replace the radiator cap.
  3. Causes of Overheating (if neglected): Old coolant loses its anti-corrosion properties, leading to rust and scale buildup that can clog the radiator and heater core. Its heat transfer capabilities also diminish, increasing the risk of overheating and potential engine damage.
  4. When to See a Shop: If you're uncomfortable with any part of the process, especially ensuring all air is purged, or if you notice persistent air bubbles or a fluctuating temperature gauge after the flush, it's best to have a professional mechanic inspect the system. They have vacuum-fill tools that can eliminate air pockets more effectively.
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