2018 Tesla Model 3 Coolant Capacity & Type

The 2018 Tesla Model 3 holds approximately 12.3 to 13.7 liters (13.0 to 14.5 quarts) of coolant in its primary cooling system.

Quick Answer

• Total Cooling System Capacity: 12.3 - 13.7 Liters (13.0 - 14.5 Quarts) for the primary cooling loop.
• OEM Coolant Spec: Tesla G-48 (Blue/Green Hybrid Organic Acid Technology - HOAT) or equivalent. Always refer to your owner's manual for the most precise and up-to-date specification.
• Mix Ratio: 50/50 Pre-mixed. Do not dilute further with water.

Capacity by Engine Option

The 2018 Tesla Model 3 did not offer traditional "engine options" in the same sense as internal combustion engine vehicles. The primary cooling system capacity is generally consistent across the different battery and motor configurations (e.g., Standard Range, Long Range, Performance) for the main thermal management loop. There can be slight variations based on specific vehicle configurations, but the range of 12.3 to 13.7 liters covers most scenarios for the main cooling circuit.

Flush Interval

Tesla recommends checking the coolant level periodically and replacing it as needed or specified in the owner's manual. For the 2018 Model 3, Tesla generally recommends a coolant service every 4 years or 50,000 miles, whichever comes first, under normal driving conditions. For severe duty (e.g., frequent towing, extreme temperatures, track use), it may be advisable to inspect or replace it more frequently, though Tesla's documentation may not explicitly define a "severe duty" interval for coolant in the same way traditional manufacturers do.

How to Refill & Bleed

Refilling and bleeding the cooling system on a Tesla Model 3 is more complex than on many traditional vehicles due to its intricate thermal management system, which manages battery, motor, and power electronics temperatures. It is often recommended that this procedure be performed by a qualified Tesla service center or a specialist familiar with EV cooling systems.

Here are general steps, but always consult the official Tesla service manual for your specific vehicle before attempting:

1. Safety First: Ensure the vehicle is powered off and cool. Disconnect the 12V battery if performing extensive work.
2. Access: Locate the coolant reservoir(s). The Model 3 typically has a main coolant reservoir in the frunk (front trunk).
3. Drain (if flushing): If performing a full flush, safely drain the old coolant into an appropriate container. This often involves specific drain points and procedures.
4. Refill: Slowly add the specified Tesla G-48 coolant (or equivalent 50/50 pre-mix) to the reservoir up to the MAX fill line. Do not overfill.
5. Bleeding: The Tesla Model 3 cooling system is designed to be largely self-bleeding through its internal pumps and valves. However, after a significant coolant loss or replacement, it may require specific service mode procedures (accessible via diagnostic tools) to fully circulate and purge air from the system. Some technicians may use a vacuum fill tool to assist with initial filling and minimize air pockets. Drive the vehicle and recheck the coolant level after it has cooled down, topping up as necessary.

Common Cooling System Issues for this Generation

The 2018 Tesla Model 3, like all complex vehicles, can experience cooling system-related issues. Due to the integration of battery thermal management, propulsion system cooling, and cabin climate control, these systems are highly intertwined.

• Coolant Leaks: Though less common than on ICE vehicles, leaks can occur from hoses, connections, radiators (front condenser/radiator), or the various coolant pumps (there are several in a Model 3). Pinpointing the exact source can be challenging.
• Coolant Heater Issues: The electric coolant heater is crucial for battery conditioning in cold weather and heating the cabin. Malfunctions can lead to reduced cabin heat, range loss in cold climates, or error messages.
• Coolant Pump Failures: The Model 3 utilizes multiple electric coolant pumps. Failure of any of these can lead to inadequate cooling or heating, triggering warnings on the vehicle's display.
• HVAC Performance Issues: Problems with cooling or heating efficiency can sometimes be traced back to the cooling system, as refrigerants and coolants often share circuits, especially in a heat pump-equipped system (though the 2018 Model 3 uses a resistive heater for the cabin).
• Software Glitches Affecting Thermal Management: As a highly software-driven vehicle, occasional software bugs can potentially affect how the thermal management system functions, leading to unusual behavior or error codes that might seem like hardware issues.

Always ensure any cooling system work is performed with the correct coolant type and by following Tesla's specific procedures to avoid damage to sensitive components.

Find a trusted shop on Repairius.