2019 Jeep Wrangler Coolant Capacity & Type

The 2019 Jeep Wrangler JL with the 3.6L Pentastar V6 engine holds approximately 14.5 quarts (13.7 liters) of coolant, and the 2.0L Hurricane inline-4 engine holds approximately 9.3 quarts (8.8 liters) of coolant.

Quick Answer

3.6L Pentastar V6:

• Total Cooling System Capacity: Approximately 14.5 quarts (13.7 liters)
• OEM Coolant Spec: Mopar Antifreeze/Coolant 10 Year/150,000 Mile Formula OAT (Organic Additive Technology) in Purple. Meets Chrysler material standard MS-90032.
• Mix Ratio: 50/50 pre-mixed coolant, or 50/50 concentrate mixed with distilled water.

2.0L Hurricane Inline-4:

• Total Cooling System Capacity: Approximately 9.3 quarts (8.8 liters)
• OEM Coolant Spec: Mopar Antifreeze/Coolant 10 Year/150,000 Mile Formula OAT (Organic Additive Technology) in Purple. Meets Chrysler material standard MS-90032.
• Mix Ratio: 50/50 pre-mixed coolant, or 50/50 concentrate mixed with distilled water.

Capacity by Engine Option

Flush Interval

The recommended coolant flush interval for the 2019 Jeep Wrangler is 10 years or 150,000 miles, whichever comes first, under normal driving conditions. If your Wrangler is subjected to severe duty, such as heavy towing, off-roading, or extreme temperatures, it's advisable to consider more frequent inspections and potentially earlier flushing – typically around 5 years or 75,000 miles.

How to Refill & Bleed

Refilling and bleeding the cooling system on a 2019 Jeep Wrangler is crucial to prevent air pockets, which can lead to overheating. Always perform this on a cool engine.

1. Drain: With the engine cool, place a drain pan under the radiator. Open the radiator drain cock. Remove the radiator cap to allow more complete draining. Some models may have an engine block drain plug; consult your service manual for its location.
2. Close Drain & Fill: Once drained, close the radiator drain cock. Begin filling the cooling system through the radiator fill neck with the correct Mopar OAT coolant (purple, MS-90032) mixed 50/50 with distilled water.
3. Bleeding: The 2019 Jeep Wrangler typically has a self-bleeding design, but it's still important to facilitate the process:
   • Fill the reservoir to the "COLD" mark.
   • Start the engine with the heater set to full hot and the fan on low (this opens the heater core valve).
   • Allow the engine to reach operating temperature. The thermostat will open, and coolant will begin to circulate.
   • Monitor the coolant level in the radiator fill neck (if accessible and safe) and the reservoir. Top off as needed.
   • You may need to gently squeeze the upper and lower radiator hoses to help dislodge air bubbles.
   • Run the engine for about 15-20 minutes, periodically revving it gently to 2,000-2,500 RPM for 30 seconds at a time.
   • Turn off the engine and allow it to cool completely.
   • Check the coolant level in the reservoir and top off to the "COLD" mark if necessary. Repeat the heating/cooling cycles a few times over the next day or two to ensure all air is purged.

For best results, especially after a major component replacement, some professional workshops use a vacuum-fill tool to completely evacuate air from the system before filling.

Common Cooling System Issues

Owners of 2018-present Jeep Wranglers (JL generation) may encounter a few common cooling system issues:

• Thermostat Housing Leaks: Plastic thermostat housings can be prone to cracking or gasket leaks, leading to coolant loss. Keep an eye out for pink or purple residue around the housing.
• Radiator Leaks: Radiators, particularly those with plastic end tanks, can develop cracks or leaks over time due to heat cycling and vibration, leading to gradual coolant loss and potential overheating if not addressed.
• Water Pump Failure: While less common than thermostat issues, water pump bearing failure or seal leaks can occur, manifesting as a whining noise or coolant weeping from the pump's weep hole.
• Coolant Temperature Sensor Issues: Faulty coolant temperature sensors can lead to inaccurate temperature readings, causing the engine fan to run excessively or not at all, or triggering false overheating warnings.
• Heater Core Clogging (less common with proper maintenance): While the purple OAT coolant is designed to prevent this, using incompatible coolants or neglecting flush intervals can lead to heater core clogging, resulting in a lack of cabin heat.

Always ensure you use the specified Mopar OAT MS-90032 coolant to prevent compatibility issues that can lead to premature component failure and cooling system breakdown.

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