2015 Honda Pilot Coolant Capacity & Type

Your 2015 Honda Pilot holds approximately 8.2 US quarts (7.8 liters) of coolant in its cooling system.

Quick Answer

• Total Cooling System Capacity: Approximately 8.2 US quarts (7.8 liters)
• OEM Coolant Specification: Honda Long-Life Antifreeze/Coolant Type 2 (Blue, P-OAT Hybrid Coolant)
• Mix Ratio: 50/50 Pre-mixed (do not add water)

Capacity by Engine Option

All 2015 Honda Pilot models came with a single engine option, the 3.5L V6 (J35Z4).

Flush Interval

Maintaining your coolant is crucial for the longevity of your engine. Honda recommends the following coolant flush intervals for your 2015 Pilot:

• Normal Duty: Replace initially at 120,000 miles or 10 years, then every 60,000 miles or 5 years thereafter.
• Severe Duty: If you regularly drive in severe conditions (e.g., extreme temperatures, heavy towing, mountainous terrain), it's wise to consider shorter intervals, potentially around 60,000 miles or 5 years for the initial change and then every 30,000 miles or 2-3 years.

Always refer to your owner's manual for the most accurate and up-to-date maintenance schedule for your specific vehicle.

How to Refill & Bleed

Properly refilling and bleeding the cooling system is essential to prevent air pockets, which can lead to overheating. Here's a general procedure for your 2015 Honda Pilot:

1. Safety First: Ensure the engine is completely cool before starting. Wear appropriate personal protective equipment, including gloves and eye protection.
2. Drain Old Coolant: With the engine off and cool, open the radiator drain plug (petcock) located at the bottom of the radiator. You may also need to open the engine block drain plug (if accessible and equipped) for a more complete drain. Catch all old coolant in a suitable drain pan and dispose of it responsibly.
3. Flush (Optional but Recommended): If flushing, close the drain plugs and fill the system with distilled water. Run the engine with the heater on high until it reaches operating temperature, then let it cool and drain. Repeat until the water runs clear. This helps remove residual old coolant and contaminants. (Be sure to drain all plain water before adding new coolant).
4. Close Drains & Fill with New Coolant: Close the radiator and engine block drain plugs. Slowly fill the radiator with new Honda Type 2 coolant (pre-mixed 50/50) until it reaches the top of the filler neck. Fill the coolant reservoir to the MAX line.
5. Bleeding the System: This is a critical step for the Pilot. Leave the radiator cap off. Start the engine and let it run with the heater on full blast and the fan on low. This helps open the heater core valve and circulate coolant through the entire system. Watch for air bubbles rising to the top of the radiator filler neck. Squeeze the upper and lower radiator hoses repeatedly to help dislodge air pockets.
6. Maintain Level: As the engine warms up and air escapes, the coolant level in the radiator will likely drop. Continue to add coolant to keep it full.
7. Special Bleed Screw (if applicable): Some vehicles have a bleed screw or valve. On the 2015 Honda Pilot, there isn't a specific bleed screw in the traditional sense, but allowing the engine to warm up with the cap off is key. Some technicians find elevating the front of the vehicle slightly can help air escape.
8. Run and Monitor: Once the engine reaches operating temperature and no more air bubbles appear, install the radiator cap. Take the vehicle for a short drive, monitoring the temperature gauge. Allow the engine to cool completely, then recheck the coolant level in the reservoir and top off if necessary.

Common Cooling System Issues for this Generation (2009-2015 Honda Pilot)

The second-generation Honda Pilot (2009-2015) is generally reliable, but some cooling system issues can crop up with age and mileage:

• Radiator Leaks: Over time, the plastic end tanks of the radiator can become brittle and crack, leading to leaks. Look for pink or blue crusty residue around the radiator seams.
• Water Pump Failure: The water pump can develop leaks or its bearings can fail, causing noise or overheating. This is often replaced with the timing belt around the 100,000-mile mark as preventative maintenance.
• Thermostat Issues: A failing thermostat can cause the engine to overheat (stuck closed) or run too cool (stuck open). Symptoms include fluctuating temperature gauges or the engine taking a long time to warm up.
• Coolant Leaks from Hoses: Radiator hoses, heater hoses, and other smaller coolant lines can degrade, crack, and leak over time. Inspect them regularly for bulges, cracks, or softness.
• Coolant Reservoir Leaks or Cracks: The plastic coolant overflow reservoir can develop cracks, especially around hose connections, leading to coolant loss. Ensure the cap is sealing properly.
• A/C Condenser/Radiator Fan Issues: While not directly a coolant issue, issues with the cooling fans can lead to overheating, especially in stop-and-go traffic or hot weather, as they are crucial for airflow through the radiator.

Regular inspection of your cooling system components and adherence to the recommended maintenance schedule will help prevent major issues and keep your 2015 Honda Pilot running smoothly.

Find a trusted shop on Repairius.