2015 Ram 2500 Coolant Capacity & Type

The 2015 Ram 2500 holds approximately 16-17 quarts (15.1-16.1 liters) of coolant in its cooling system, depending on the engine. Properly maintaining your cooling system with the correct type and amount of coolant is crucial for preventing overheating and ensuring the longevity of your engine.

Quick Answer

• Total Cooling System Capacity: 16-17 quarts (15.1-16.1 liters) - Varies by engine type.
• OEM Coolant Spec: Mopar Antifreeze/Coolant 10 Year/150,000 Mile Formula HOAT (Hybrid Organic Additive Technology) in an orange/pink color, meeting Chrysler MS-9769.
• Mix Ratio: Typically 50/50 pre-mix, or 50/50 concentrate mixed with distilled water.

Capacity by Engine Option

The coolant capacity for your 2015 Ram 2500 will vary slightly based on the engine installed:

Note: Diesel engine capacities are significantly higher due to larger cooling systems to manage increased heat. Always double-check your owner's manual for the most precise figures for your specific sub-model and any optional equipment.

Flush Interval

Maintaining your coolant at the recommended intervals is vital for preventing corrosion and ensuring optimal heat transfer.

• Normal Duty: For most driving conditions, Chrysler recommends replacing the HOAT coolant every 10 years or 150,000 miles, whichever comes first.
• Severe Duty: If your 2015 Ram 2500 is frequently used for heavy towing, off-roading, or in extreme temperatures, consider more frequent inspections and potentially earlier flushes, perhaps around every 5 years or 75,000 miles. Always consult your owner's manual for the most accurate severe-duty recommendations.

How to Refill & Bleed

Refilling and bleeding your cooling system correctly after a flush or repair is critical to avoid air pockets, which can cause overheating.

1. Safety First: Ensure the engine is completely cool before attempting any coolant system work. Wear appropriate personal protective equipment, including gloves and eye protection.
2. Drain Old Coolant: With a drain pan underneath, open the radiator drain cock (petcock) on the bottom of the radiator. For a more complete drain, you may also need to open the block drains (consult your service manual for locations, especially on diesel models).
3. Flush (Optional but Recommended): After draining, close the petcock and fill the system with distilled water. Run the engine with the heater on until it reaches operating temperature (thermostat opens). Drain again. Repeat this process until the water runs clear. Never use tap water for flushing or mixing, as it contains minerals that can harm the cooling system.
4. Refill with New Coolant: Close all drain points. Slowly pour a 50/50 mixture of HOAT coolant and distilled water (or use pre-mixed coolant) into the radiator fill neck. Fill until the coolant level is at the "COLD" mark on the coolant reservoir. Keep the engine off.
5. Bleed Air:
   • Gasoline Engines (5.7L/6.4L HEMI): These systems are largely self-bleeding. With the radiator cap off (or loosely installed) and the reservoir cap off, start the engine and let it idle. Turn the heater to full hot and fan on low. As the engine warms, cooler will be drawn into the engine. Squeeze the upper and lower radiator hoses several times to help purge air bubbles. Watch for the thermostat to open (you