2015 Nissan Altima Coolant Capacity & Type

Quick answer

The 2015 Nissan Altima holds between 7.5 and 8.2 quarts (7.1 to 7.8 liters) of coolant in its cooling system, depending on the engine.

• Total Cooling System Capacity: 7.5 quarts (7.1 liters) for the 2.5L 4-cylinder engine; 8.2 quarts (7.8 liters) for the 3.5L V6 engine.
• OEM Coolant Specification: Nissan Genuine Blue Long Life Antifreeze/Coolant (LLC). This is a blue-colored, phosphate-enhanced organic acid technology (P-OAT) coolant. It is essential to use a compatible P-OAT coolant to prevent corrosion and damage to cooling system components.
• Mix Ratio: Use a 50/50 mixture of concentrated coolant and distilled water, or purchase a pre-mixed 50/50 solution. Do not use tap water, as its mineral content can cause deposits and scaling within the radiator and engine.

Capacity by engine option

The required coolant capacity for a 2015 Nissan Altima varies based on the installed engine.

Flush interval

Following the correct coolant flush interval is critical to maintaining the health of your Altima's engine.

• Normal Service: Nissan recommends the first coolant change at 105,000 miles (168,000 km) or 7 years. Subsequent changes should be performed every 75,000 miles (120,000 km) or 5 years, whichever comes first.
• Severe Duty: If the vehicle is operated under severe conditions—such as frequent short trips, extensive idling, dusty environments, or towing—it is advisable to shorten the flush interval to every 30,000 to 50,000 miles.

How to refill & bleed

Properly refilling and bleeding the cooling system is crucial to avoid air pockets, which can cause overheating.

1. Safety First: Ensure the engine is completely cool before attempting to open the radiator or reservoir cap.
2. Add Coolant: Slowly add the 50/50 coolant mixture to the coolant reservoir until it reaches the MAX line. Do not fill from the radiator cap.
3. Bleed the System: The 2015 Altima does not have a traditional bleeder screw. Air is purged from the system automatically. After filling, securely install the reservoir cap.
4. Run the Engine: Start the engine and let it run for several minutes with the heater on its highest temperature setting and the fan on low. This circulates coolant through the heater core.
5. Check and Top Off: Turn the engine off and let it cool down completely. Re-check the coolant level in the reservoir and top off to the MAX line as needed. It may take a few drive cycles for all trapped air to escape, so monitor the level for a few days.

Common cooling system issues

The fifth-generation Altima (2013-2018) has a generally reliable cooling system, but some issues can arise, particularly as the vehicle ages.

• Radiator Leaks: Plastic end tanks on the radiator can develop cracks over time, leading to coolant leaks. This is often the most common failure point.
• Water Pump Failure: While not rampant, water pump failure can occur. Symptoms include a coolant leak from the front of the engine, a whining or grinding noise, and engine overheating.
• Thermostat Issues: A thermostat stuck open will cause the engine to be slow to warm up and may trigger a check engine light. A thermostat stuck closed will lead to rapid overheating.
• Coolant Leaks from Hoses: With age and mileage, rubber hoses can become brittle, crack, and leak. It is good practice to inspect all cooling system hoses during a coolant service.

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