2021 Chevrolet Malibu Coolant Capacity & Type

The 2021 Chevrolet Malibu holds approximately 7.0-7.9 quarts (6.6-7.5 liters) of coolant, depending on the engine. This article provides a comprehensive guide to your 2021 Malibu's cooling system, including capacity, coolant type, flush intervals, and proper refill procedures.

Quick Answer

• Total Cooling System Capacity: 7.0-7.9 quarts (6.6-7.5 liters)
• OEM Coolant Specification: ACDelco Dex-Cool (Orange, OAT, GM standard GMW3420 or GM 6277M)
• Mix Ratio: 50/50 Pre-mix or Concentrate mixed with distilled water

Capacity by Engine Option

Flush Interval

Maintaining your coolant is crucial for the longevity of your engine. The recommended flush intervals for a 2021 Chevrolet Malibu are:

• Normal Duty: Typically every 5 years or 150,000 miles, whichever comes first.
• Severe Duty: If you frequently drive in extreme temperatures, tow heavy loads, or drive in stop-and-go traffic, consider flushing your coolant more frequently, possibly every 3 years or 45,000 miles.

Always refer to your owner's manual for the most accurate and up-to-date maintenance schedule for your specific vehicle.

How to Refill & Bleed

Properly refilling and bleeding your 2021 Malibu's cooling system is essential to prevent air pockets that can cause overheating. Here's a general procedure:

1. Safety First: Ensure the engine is completely cool before starting.
2. Drain the System: Open the drain plug on the bottom of the radiator and remove the radiator cap to allow the coolant to drain completely into a suitable container.
3. Flush (Optional but Recommended): If performing a flush, close the drain plug, fill with distilled water, run the engine with the heater on until warm, then drain again. Repeat until the drained water is clear.
4. Refill with New Coolant: Close the drain plug and reservoir cap (if applicable). Slowly add the correct type of 50/50 pre-mixed ACDelco Dex-Cool coolant to the radiator until it's full. Fill the overflow reservoir to the "COLD FILL" line.
5. Bleed the System:
   • Start the engine with the radiator cap off. Run the engine with the heater on high. This helps open the thermostat and allows coolant to circulate through the heater core.
   • As the engine warms up, you may see air bubbles escape from the radiator. Continue to add coolant as the level drops.
   • On the 2021 Malibu, there isn't a traditional bleed screw. The system is designed to self-bleed. However, you can aid this process by gently squeezing the upper and lower radiator hoses to dislodge air bubbles.
   • Once the engine reaches operating temperature and no more air bubbles appear, replace the radiator cap.
6. Check Levels: After a test drive, allow the engine to cool completely and recheck the coolant level in the overflow reservoir. Top off if necessary.

Note: For best results and to avoid airlock issues, some technicians prefer using a vacuum-fill tool, especially after a complete drain and flush.

Common Cooling System Issues for this Generation

The 2021 Chevrolet Malibu, and this generation in general, can experience some common cooling system issues:

• Water Pump Leaks: The water pump, especially on the 1.5L and 2.0L turbo engines, can be a known leak point. Keep an eye out for pinkish-orange residue or drips under the vehicle.
• Thermostat Housing Leaks: The plastic thermostat housing can become brittle and crack over time, leading to coolant leaks.
• Radiator/Hose Leaks: As with any vehicle, wear and tear can lead to leaks in the radiator or coolant hoses. Visually inspect these components regularly.
• Coolant Expansion Tank Issues: The plastic expansion tank can develop cracks, leading to slow coolant loss.
• Engine Overheating: While less common in newer vehicles, overheating can still occur due to low coolant, a faulty thermostat, a failing water pump, or a clogged radiator.

Addressing these issues promptly can prevent more extensive engine damage. Regularly checking your coolant level and performing visual inspections are good preventative measures.

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