2015 Ram ProMaster Coolant Capacity & Type

The 2015 Ram ProMaster holds approximately 10.6 to 12.8 quarts (10 to 12.1 liters) of coolant, depending on the engine. Properly maintaining your ProMaster's cooling system is crucial for its longevity and performance, especially for a work vehicle. This guide covers everything you need to know about your ProMaster's coolant.

Quick Answer

• Total Cooling System Capacity:
  • 3.6L V6: 10.6 quarts (10.0 liters)
  • 3.0L I4 Diesel: 12.8 quarts (12.1 liters)
• OEM Coolant Spec: Mopar Antifreeze/Engine Coolant 10 Year/150,000 Mile Formula OAT (Organic Additive Technology) in a magenta/purple color. Meets FCA Material Standard MS-90032.
• Mix Ratio: Typically 50/50 pre-mixed coolant, or 50/50 concentrate with distilled water.

Capacity by Engine Option

The 2015 Ram ProMaster was available with two engine options, each with a slightly different coolant capacity:

Always consult your owner's manual for the most accurate and up-to-date information for your specific vehicle.

Flush Interval

Regular coolant flushes are vital for preventing corrosion, cavitation, and other coolant system failures. For your 2015 Ram ProMaster:

• Normal Duty: Replace coolant every 10 years or 150,000 miles, whichever comes first.
• Severe Duty (e.g., heavy towing, extreme temperatures, dusty conditions): Consider more frequent inspections and potentially earlier replacement, though the 10-year/150,000-mile interval is still very robust due to the OAT coolant.

Always check your maintenance schedule in the owner's manual as conditions and usage can vary.

How to Refill & Bleed

Maintaining a proper coolant level and ensuring no air is trapped in the system is critical. Follow these general steps, but always refer to your service manual for detailed instructions:

1. Preparation: Ensure the engine is cool. Position the vehicle on a level surface. Wear appropriate safety gear.
2. Drain: Loosen the radiator drain plug (petcock) and remove the radiator cap to allow the system to drain completely into a suitable container. Some systems may also have engine block drain plugs.
3. Flush (Optional but Recommended): If performing a full flush, close the drain plug and fill with distilled water. Run the engine with the heater on until it reaches operating temperature, then drain. Repeat until the water runs clear. Use a quality cooling system cleaner if necessary.
4. Refill: Close all drain plugs. Slowly fill the system through the radiator fill neck (or surge tank if equipped) with the specified 50/50 Mopar OAT coolant mixture. Leave the radiator cap off.
5. Bleed Air:
   • Start the engine and let it run with the heater on high. This helps open the thermostat and allows coolant to circulate through the heater core.
   • Keep an eye on the coolant level in the radiator/surge tank and top it off as needed. Air bubbles will rise and escape.
   • Some ProMaster models (especially the EcoDiesel) may have a bleed screw or procedure. Consult your service manual for its exact location and bleeding instructions. Generally, you open the bleeder valve until a steady stream of coolant escapes without air bubbles.
   • Squeeze the upper and lower radiator hoses several times to help dislodge air pockets.
   • Continue running the engine until the thermostat opens (the upper radiator hose will get hot). Ensure the cooling fans cycle on and off.
6. Final Check: Once no more air bubbles appear and the system is full, install the radiator cap. Check for leaks. Drive the vehicle and re-check the coolant level in the overflow reservoir after the engine has cooled down. Top off as necessary.

Common Cooling System Issues

For the 2015 Ram ProMaster, common cooling system issues can include:

• Thermostat Failure: The thermostat can stick open or closed, leading to the engine running too cold or overheating.
• Water Pump Leaks/Failure: The water pump can develop leaks from its seals or bearings, or its impeller can corrode or fail, leading to poor coolant circulation.
• Radiator Leaks: Radiators can develop leaks due to corrosion, stone damage, or stress cracks in plastic end tanks.
• Hose Leaks: Coolant hoses can deteriorate over time, leading to cracks, splits, or loose connections and leaks.
• Coolant Reservoir Leaks: The plastic overflow reservoir can crack or its cap can fail, leading to coolant loss.
• EGR Cooler Issues (EcoDiesel): The EcoDiesel engine can be susceptible to EGR cooler issues, which, in some cases, can lead to coolant loss or contamination.
• Coolant Sensor Failures: Faulty coolant temperature sensors can provide inaccurate readings to the engine control unit, impacting engine performance and fan operation.

Regular inspections and adherence to the recommended maintenance schedule can help prevent or quickly address these issues.

Find a trusted shop on Repairius.