2018 Tesla Model S Coolant Capacity & Type

The 2018 Tesla Model S holds approximately 14.2 to 14.8 quarts (13.4 to 14.0 Liters) of coolant in its primary cooling system.

Quick Answer

• Total Cooling System Capacity: 14.2 - 14.8 quarts (13.4 - 14.0 Liters)
• OEM Coolant Spec: Tesla-specific long-life coolant, typically a pink/red or blue/green (depending on manufacturing location/batch) P-OAT (Phosphated Organic Acid Technology) or Si-OAT (Silicated Organic Acid Technology). Always refer to your owner's manual or Tesla service documentation for the precise specifications, as Tesla may use different formulations. Some variations might be specified as containing "Glyfrozane".
• Mix Ratio: 50/50 Pre-diluted (do NOT mix with other coolant types).

Capacity by Engine Option

This article focuses on the main drive unit and battery cooling system, which is the primary coolant circuit on the 2018 Tesla Model S. The capacity listed above is for this main system. There may be separate, smaller cooling circuits for specific components like onboard chargers or power electronics, each with its own, usually smaller, capacity.

Flush Interval

Unlike traditional internal combustion engine vehicles, Tesla vehicles, including the 2018 Model S, often have extended coolant service intervals. Tesla generally recommends inspecting the coolant level and condition every year or 12,500 miles, but a full coolant flush is typically not recommended or required under normal operating conditions. Tesla's official stance has been that the coolant is a "lifetime fill" for the battery and drivetrain, or at least for very extended periods. However, it's crucial to check your specific owner's manual or the latest Tesla service recommendations for the most accurate and up-to-date information regarding your vehicle's coolant maintenance schedule.

How to Refill & Bleed

Refilling and bleeding the cooling system on a Tesla Model S is a more complex procedure than on many conventional vehicles due to the sophisticated cooling architecture. It is generally recommended to have this service performed by a Tesla Service Center or a qualified independent specialist familiar with Tesla vehicles. Improper bleeding can lead to air pockets, which can severely impact cooling efficiency and potentially damage expensive components like the battery or drive units.

If you are performing a top-off, ensure the vehicle is off and cool. Access the coolant reservoir, typically located under the frunk. Fill to the MAX line with the specified Tesla coolant. Do not overfill. For a full refill and bleed, specialized vacuum fill tools and diagnostic equipment are often required to properly evacuate air from the system and ensure all air pockets are removed. There are no easily accessible bleed screws in the conventional sense; the system relies on a controlled vacuum fill and circulation procedure.

Common Cooling System Issues

While generally reliable, the cooling system in the 2018 Tesla Model S can experience issues, often related to its complexity:

• Coolant Leaks: Though less common than in ICE vehicles, leaks can occur from hoses, connections, the radiator (for the drive units), or pumps. These can be difficult to pinpoint due to the sealed nature of many components.
• HVAC/Heat Issues: The climate control system is integrated with the main cooling loop. Issues with heating or AC can sometimes stem from low coolant levels, air in the system, or a faulty coolant control valve.
• Coolant Pump Failures: Tesla vehicles utilize multiple electric coolant pumps. Failure of one of these pumps can lead to overheating of specific components, reduced range, or warning messages.
• Coolant Contamination: While unlikely with a sealed system, using incorrect coolant types or mixing coolants can lead to gelling, corrosion, and damage to seals and internal components. Always use Tesla-approved coolant.
• Battery Temp Warnings: In extreme conditions or if there's a cooling system malfunction, the vehicle may display warnings about battery temperature, leading to reduced power or range to protect the battery pack.

It is vital to address any coolant-related warnings promptly to prevent potential damage to the battery and drivetrain components.

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