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How Much Coolant Does A 5.7 Hemi Take

When it comes to maintaining the optimal performance of your Hemi 5.7 liter V8 engine, proper cooling system care is paramount. Today, we delve into the essential process of bleeding the cooling system, an often overlooked yet critical procedure to eliminate air pockets that can hinder your engine’s performance.

Understanding the Bleeding Port

Many enthusiasts have reached out, seeking clarity on the coolant bleed procedure for the Hemi. Let’s start by locating the crucial bleeding port on this powerhouse engine.

Identifying the Bleed Port

The bleed port, pivotal for expelling trapped air, is nestled discreetly on the backside of the thermostat housing. For ease of access, it typically resides on the front water pump or timing cover. Keep an eye out for a recessed Allen.

Accessing the Port

Accessing this port might require maneuvering around engine components like brackets. On certain models like Chargers, Challengers, Magnums, and 300s, obstruction is minimal, simplifying access. For trucks, some components might be in the way but manageable.

Bleeding Procedure

Once you’ve located the bleed port, using a 5/16 ratchet, carefully loosen the recessed Allen. It’s advisable to apply thread sealant to maintain system integrity.

Executing the Bleeding Process

Now, let’s navigate through the sequential steps to effectively bleed the cooling system of your Hemi 5.7 liter V8.

  1. Prepare the System: With the engine cooled down, position the coolant bottle aside and ensure the cap is open.
  2. Adding Coolant: Introduce a 50/50 mix of antifreeze and distilled water into the system. Continuously fill until coolant starts emerging from the bleed port.
  3. Understanding Air Trapping: The bleed port’s positioning behind the thermostat housing often traps air until the engine’s temperature rises enough to open the thermostat. This allows air to escape, facilitating proper coolant flow.
  4. Sealing and Testing: Apply thread sealant to the recessed Allen and securely fasten it back into place. Afterwards, verify the system’s integrity by starting the engine and checking for leaks.
  5. Monitoring and Adjusting: Over the next few days, inspect the coolant bottle regularly, especially in the mornings when the engine is cold. Slight adjustments may be necessary to maintain the correct level.

Final Notes and Recommendations

Bleeding the cooling system is a crucial but straightforward process that ensures your Hemi 5.7 liter V8 operates at its peak. Here are some additional recommendations:

  • Post-Procedure Check: After bleeding, ensure the coolant level stabilizes and remains within the recommended range.
  • Routine Checks: Regularly monitor the coolant system to catch any anomalies early on, preventing potential issues down the line.
  • Expert Guidance: For specific queries or additional guidance on Chrysler, Dodge, Jeep, Ram, or Fiat vehicles, feel free to reach out via email to [email protected].


Understanding the bleed port’s location and executing the bleeding process efficiently is key to maintaining your Hemi’s cooling system. By following these steps, you’ll ensure optimal performance and longevity for your vehicle.