2019 Ram ProMaster: Coolant Capacity & Type

The 2019 Ram ProMaster with the 3.6L Pentastar V6 engine holds approximately 10.1 quarts (9.6 liters) of coolant.

Quick Answer: 2019 ProMaster Coolant Specs

For a quick reference, here are the essential specifications for your ProMaster's cooling system:

• Total Capacity (3.6L V6): 10.1 quarts (9.6 liters)
• OEM Coolant Specification: Mopar 10-Year/150,000 Mile OAT (Organic Additive Technology) Coolant
• Mopar Spec Number: MS-12106
• Color: Purple
• Mix Ratio: 50/50 (pre-mixed or concentrate mixed with distilled water)

Capacity by Engine Option

The vast majority of 2019 Ram ProMaster vans sold in North America are equipped with the 3.6L Pentastar V6 engine. This has been the standard gasoline engine for this platform for several years, known for its balance of power and reliability. While an EcoDiesel was offered in previous model years, for 2019, your ProMaster is almost certainly running the Pentastar.

It is critical to use the correct coolant type. The specified purple OAT coolant is formulated for aluminum engines and long service intervals. Using an older-style HOAT (orange or pink) or IAT (green) coolant can lead to chemical reactions that cause corrosion, sludge formation, and premature failure of cooling system components.

Flush Interval

Ram specifies a remarkably long service interval for the factory-fill coolant, a testament to the stability of modern OAT formulations.

• Normal Service: Replace coolant every 10 years or 150,000 miles, whichever comes first.
• Severe Duty: For vehicles used in commercial applications, constant idling, dusty conditions, or extreme temperatures, consider shortening this interval to 100,000 miles as a proactive measure to protect the engine and heater core.

How to Refill & Bleed the System

The 3.6L Pentastar engine can be prone to trapping air during a coolant refill, which can cause overheating and poor heater performance. Following the correct procedure is essential.

1. Safety First: Ensure the engine is completely cool before opening the cooling system.
2. Locate Bleeder Screw: Find the small, hex-head bleeder screw located on the thermostat housing, near the top-front of the engine.
3. Use a Spill-Free Funnel: Attach a large, spill-free funnel to the radiator or coolant reservoir cap opening. This is the most critical tool for preventing air pockets.
4. Open Bleeder & Fill: Open the bleeder screw a few turns. Begin slowly pouring the 50/50 coolant mixture into the funnel. Continue filling until a steady stream of coolant, free of air bubbles, flows from the bleeder screw.
5. Close Bleeder: Tighten the bleeder screw snugly (do not overtighten).
6. Continue Filling: Fill the system via the funnel until the level is stable and well above the "Full" mark.
7. Run Engine: Start the engine with the heater set to the highest temperature and the fan on high. Let the engine idle. You will see bubbles coming up into the funnel as air works its way out of the system.
8. Top Off: As the thermostat opens and the level in the funnel drops, continue adding coolant to keep it full. Once the bubbling stops and the engine reaches operating temperature, the system is bled.
9. Final Steps: Squeeze the upper radiator hose to burp any final air pockets. Let the engine cool down, remove the funnel, and adjust the coolant level in the reservoir to the "MAX" line.

Pro Tip: A professional vacuum-fill tool makes the job faster and virtually guarantees no air is trapped in the system.

Common Cooling System Issues

While the ProMaster is a workhorse, some common issues can arise in the cooling system, especially at higher mileage:

• Cracked Thermostat Housing: The plastic housing that contains the thermostat and bleed screw can become brittle with age and heat cycles, leading to cracks and coolant leaks. This is a very common failure point on the 3.6L Pentastar engine across all FCA/Stellantis models.
• Radiator Leaks: Leaks can develop in the aluminum core or at the plastic end tanks of the radiator, often due to road debris or vibration over time.
• Water Pump Failure: The water pump is a wear-and-tear item. Signs of failure include a coolant leak from the front of the engine or a grinding/whining noise.
• Heater Core Blockage: If the incorrect coolant is used or the system is neglected, sludge can build up and clog the small passages of the heater core, resulting in poor or no heat in the cabin.

Regularly inspecting your hoses, checking for drips under the van, and monitoring your temperature gauge are the best ways to catch these issues early.

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