2025 Ram ProMaster Coolant Capacity & Type

The 2025 Ram ProMaster holds approximately 13-14 quarts (12.3-13.2 liters) of coolant.

Quick Answer

• Total Cooling System Capacity: 13-14 quarts (12.3-13.2 liters)
• OEM Coolant Specification: Mopar OAT (Organic Additive Technology) MS-12106, typically purple in color.
• Mix Ratio: 50/50 pre-mix or 50% concentrate with 50% distilled water.

Capacity by Engine Option

The 2025 Ram ProMaster is expected to offer a single engine option, the 3.6L Pentastar V6. Therefore, the coolant capacity listed above applies to all models.

Flush Interval

For normal duty, the recommended coolant flush interval for the 2025 Ram ProMaster is typically around 10 years or 150,000 miles, whichever comes first. For severe duty applications (e.g., frequent towing, extreme temperatures, dusty conditions), it's advisable to inspect the coolant annually and consider flushing every 5 years or 75,000 miles.

How to Refill & Bleed

Refilling and bleeding the cooling system on your 2025 Ram ProMaster is crucial to prevent air pockets that can cause overheating. Here's a general procedure:

1. Drain the old coolant: With the engine cool, place a drain pan under the radiator and open the petcock or remove the lower radiator hose to drain the system. Allow it to drain completely.
2. Flush (optional but recommended): If performing a flush, close the drain, fill with distilled water, run the engine with the heater on until it reaches operating temperature, then cool and drain again. Repeat until the drained water is clear.
3. Refill: Close the drain and slowly add the specified Mopar OAT MS-12106 coolant (50/50 mix) to the radiator. Fill until it reaches the top.
4. Burp the system: Start the engine and turn the heater to its highest setting. Allow the engine to warm up to operating temperature. As the engine warms, air bubbles will escape. You may need to gently squeeze the upper and lower radiator hoses to help dislodge air pockets. For the Ram ProMaster, pay close attention to any bleed screws or valves located on the thermostat housing or radiator hoses. These are designed to help release trapped air. Open them slightly until a steady stream of coolant (without air) appears, then close them.
5. Maintain Fluid Level: As air escapes, the coolant level in the radiator and reservoir will drop. Continuously top off to the "FULL" mark on the coolant reservoir.
6. Test Drive: Once the engine is at operating temperature and the coolant level is stable, take the vehicle for a short drive. Monitor the temperature gauge closely.
7. Recheck Later: After the engine has cooled completely, recheck the coolant level in the reservoir and top off if necessary.

Common Cooling System Issues

While the 2025 Ram ProMaster is a new model, based on previous generations and the 3.6L Pentastar engine, here are some common cooling system issues that potential owners might encounter:

• Thermostat Housing Leaks: The thermostat housing, often made of plastic, can be prone to cracking and leaking over time, especially with age and heat cycles.
• Water Pump Leaks/Failure: The water pump, a critical component for circulating coolant, can develop leaks from its seals or bearings, leading to coolant loss or inadequate circulation.
• Radiator Leaks: Road debris or age can cause the radiator fins or tanks to become damaged, leading to leaks.
• Hose Leaks: Coolant hoses can degrade over time, leading to cracks, bulges, and ultimately leaks, especially at connection points.
• Coolant Temperature Sensor Malfunctions: A faulty coolant temperature sensor can provide incorrect readings to the engine control unit, leading to inaccurate temperature gauge readings or engine performance issues.
• Overheating (often due to air pockets): Inadequate bleeding of the cooling system after service can leave air pockets, causing localized hot spots and potential overheating.

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