2019 Honda Pilot Coolant Capacity & Type

The 2019 Honda Pilot cooling system holds approximately 7.3 quarts (6.9 liters) of coolant.

Quick Answer

• Total Cooling System Capacity: Approximately 7.3 quarts (6.9 liters)
• OEM Coolant Spec: Honda Long-Life Antifreeze/Coolant Type 2 (Blue, P-OAT Hybrid Coolant)
• Mix Ratio: 50/50 Pre-mix (do not add water)

Capacity by Engine Option

The 2019 Honda Pilot is available with a single engine option, the 3.5L V6 (J35Y6).

Flush Interval

Honda recommends the initial coolant flush and replacement at 120,000 miles or 10 years, whichever comes first. Subsequent coolant changes are then recommended every 60,000 miles or 5 years under normal driving conditions. For severe duty, it is advisable to inspect your coolant more frequently and consider reducing the flush interval.

How to Refill & Bleed

Refilling and bleeding the cooling system on a 2019 Honda Pilot requires careful attention to ensure all air is removed to prevent overheating.

1. Drain the System: With the engine cool, place a drain pan under the radiator draincock (on the bottom of the radiator, usually on the driver's side). Open the draincock and the radiator cap to allow the coolant to drain completely. Some coolant will remain in the engine block; consult a service manual for block drain plug locations if a complete drain is desired.
2. Close Draincock: Once drained, securely close the radiator draincock.
3. Refill: Slowly pour new Honda Type 2 coolant into the radiator opening until it reaches the neck. Fill the reservoir to the MAX line.
4. Bleed Air:
   • Start the engine with the radiator cap off (or loosely on, depending on the method).
   • Set the climate control to full hot with the fan on low (this opens the heater core valve).
   • Let the engine run until it reaches operating temperature and the cooling fans cycle on at least twice. This helps circulate the coolant and push air out.
   • Gently squeeze the upper and lower radiator hoses a few times to help dislodge air bubbles.
   • Monitor the coolant level in the radiator; top up as necessary. Small bubbles should stop appearing.
   • Pilot-Specific Tip: The 3.5L V6 engine may have a bleed bolt near the thermostat housing or on a coolant hose pipe. Loosening this bolt slightly while filling can help trapped air escape more quickly.
5. Final Check: Install the radiator cap, turn off the engine, and allow it to cool completely. Recheck the coolant level in the reservoir and top up to the MAX line if needed. Check for any leaks.

Common Cooling System Issues

For the third generation Honda Pilot (2016-2022), here are some common cooling system issues to be aware of:

• Radiator Leaks: Over time, radiators can develop leaks due to corrosion, stone chips, or plastic end tank failures. Keep an eye out for green or blue stains under the vehicle.
• Water Pump Failure: The water pump circulates coolant throughout the engine. Bearings can wear out, leading to leaks or noise. Since it's often driven by the serpentine belt, a failing water pump might create a squealing sound.
• Thermostat Issues: A stuck-open thermostat can cause the engine to run too cool, leading to inefficient operation. A stuck-closed thermostat is more serious, causing rapid overheating and potential engine damage.
• Coolant Leaks from Hoses or Clamps: Hoses can degrade and crack over time, and clamps can lose their sealing ability. Regular inspection of hoses for swelling, cracking, or softening is recommended.
• Reservoir Tank Leaks/Cracks: The plastic coolant reservoir can develop cracks, leading to coolant loss. This is often more noticeable as the coolant level consistently drops.
• Electric Cooling Fan Malfunctions: Issues with the electric cooling fans (motor failure, relay problems, or wiring issues) can lead to overheating, especially in stop-and-go traffic or at idle.

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