2020 Honda Odyssey Coolant Capacity & Type

The 2020 Honda Odyssey cooling system holds approximately 7.2 quarts (6.8 liters) of coolant.

Quick Answer

• Total Cooling System Capacity: 7.2 quarts (6.8 liters)
• OEM Coolant Spec: 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

The 2020 Honda Odyssey was offered with a single engine option, the 3.5L V6 (J35Y6).

Flush Interval

Honda recommends specific flush intervals for the 2020 Odyssey:

• Normal Duty: Replace at 120,000 miles (192,000 km) or 10 years, whichever comes first. After the initial replacement, subsequent replacements are recommended every 60,000 miles (96,000 km) or 5 years.
• Severe Duty: If operating under severe conditions (e.g., extremely hot climates, heavy towing, mountainous driving), it is advisable to replace the coolant more frequently, potentially every 60,000 miles (96,000 km) or 5 years, even for the initial fill.

How to Refill & Bleed

Properly refilling and bleeding the cooling system of your 2020 Honda Odyssey is crucial to prevent air pockets, which can lead to overheating. Always perform this procedure on a cool engine.

1. Drain Old Coolant: With the engine cool, open the drain plug on the bottom of the radiator to drain the old coolant into a suitable container. Some models may also have an engine block drain plug.
2. Close Drain Plugs: Once drained, securely close all drain plugs.
3. Refill with New Coolant: Slowly add the Honda Long-Life Antifreeze/Coolant Type 2 (50/50 pre-mix) into the radiator until it's full. Fill the reserve tank to the MAX line.
4. Bleed Air: Leave the radiator cap off and start the engine. Let it run until it reaches normal operating temperature and the cooling fan cycles on and off at least twice. This helps to purge air from the system. Squeeze the upper and lower radiator hoses several times to help release trapped air.
5. Maintain Fluid Level: As the engine warms up, the coolant level in the radiator may drop. Continue to add coolant as needed to keep the radiator full.
6. Install Radiator Cap: Once the fans have cycled and no more air bubbles are visible, install the radiator cap.
7. Monitor: After driving, recheck the coolant level in the reserve tank and top it off if necessary. Monitor the temperature gauge for the next few drives to ensure no overheating occurs.

Note: The 2020 Honda Odyssey does not typically feature a specific bleed screw. Rely on the radiator cap opening and hose squeezing method for air purging. A vacuum-fill tool can make this process more efficient and thorough.

Common Cooling System Issues for this Generation (2018-Present)

While the 2020 Honda Odyssey is generally reliable, some cooling system issues that can arise in this generation include:

• Radiator Leaks: Over time, the plastic end tanks of the radiator can become brittle and crack, leading to coolant leaks. Damage from road debris can also be a cause.
• Water Pump Failure: The water pump, responsible for circulating coolant, can eventually develop leaks or internal bearing failure, signaled by a whining noise or coolant dripping.
• Thermostat Issues: A faulty thermostat can cause the engine to overheat (if stuck closed) or run too cool (if stuck open). Symptoms include erratic temperature gauge readings or the engine taking a long time to warm up.
• Coolant Hose Leaks: Hoses can degrade, crack, or become loose over time, leading to coolant leaks. Regularly inspect hoses for signs of wear.
• Coolant Reservoir Leaks: The plastic coolant reservoir can sometimes develop cracks, leading to a slow loss of coolant.
• Overheating due to Air in System: Improper bleeding of the cooling system after service can leave air pockets, which significantly reduce cooling efficiency and can cause overheating.

Regular maintenance and adherence to the recommended coolant flush intervals are key to preventing these issues and ensuring the longevity of your cooling system.

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