2021 Tesla Model 3 Coolant Capacity & Type

The 2021 Tesla Model 3 has a total cooling system capacity of approximately 10.3 liters (10.9 quarts) for the main battery and powertrain circuit.

Quick Answer

• Total Capacity: ~10.3 L / 10.9 qt
• OEM Coolant Spec: Tesla G-48 ethylene glycol coolant (Blue, HOAT)
• Mix Ratio: 50/50 mix of G-48 coolant and deionized water.

Capacity by Engine Option

All 2021 Tesla Model 3 variants (Standard Range, Long Range, Performance) use the same fundamental cooling system architecture and have a similar coolant capacity of approximately 10.3 liters.

Flush Interval

Tesla specifies a long-life interval for its G-48 coolant.

• Normal Service: 4 years or 50,000 miles (80,000 km), whichever comes first.
• Severe Duty: Under extreme operating temperatures or conditions, more frequent checks are advised, though the replacement interval officially remains the same.

How to Refill & Bleed

Servicing a Tesla's cooling system is not a typical DIY procedure and requires special tools. The system is complex, with multiple loops for the battery, powertrain, and cabin heater. A specific "purge and fill" procedure must be initiated using service software.

1. Access Service Mode: The vehicle must be put into Service Mode using a laptop with the appropriate software.
2. Initiate Coolant Air Purge: The software commands the vehicle to run a specific sequence, activating various pumps and valves to systematically purge air from all cooling circuits.
3. Vacuum Fill: A vacuum filler is connected to the reservoir. This tool pulls the system into a deep vacuum to remove all remaining air pockets before coolant is drawn in.
4. Fill & Verify: The 50/50 pre-mixed G-48 coolant is then drawn into the system. The technician verifies the level and ensures no leaks are present after the procedure.

Warning: Attempting to drain and fill the system without the proper software and vacuum tools will lead to air pockets, which can cause overheating of the battery or powertrain components, leading to serious damage.

Common Cooling System Issues

The Tesla Model 3 cooling system is generally robust, but some issues have been noted for this generation.

• Coolant "Gelling" or Contamination: Early production models sometimes experienced issues with the coolant breaking down or reacting with other materials in the system, leading to a gel-like substance that could clog passages. Using only the specified Tesla G-48 coolant is critical.
• Failed "Superbottle" Sensor: The "Superbottle" is a multi-chambered coolant reservoir that manages different cooling loops. The coolant level sensor within this bottle can sometimes fail, leading to erroneous "low coolant" warnings on the center display.
• Pump or Valve Failures: While not widespread, failures of the electric coolant pumps or the multi-way valves that direct coolant flow can occur, which will typically trigger a fault code and a warning message.

Find a trusted shop on Repairius.