my Tesla Model S Original (2012-2020) has a low coolant warning, what do I need to check?

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

560 words

Problem Statement

Learn how to diagnose and fix low coolant warning in Tesla Model S (2012-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Cooling System

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is turned off and cooled down before opening the coolant reservoir to avoid burns.

Symptoms

•Low coolant warning message on the dashboard
•Possible coolant leakage under the vehicle
•Overheating engine or battery pack
•Reduced heating or cooling performance in the cabin
•Increased electric motor temperature warnings

Diagnostic Steps

1
Check the coolant level in the reservoir and confirm it is below the minimum mark.
2
Inspect for visible signs of coolant leaks around the reservoir, hoses, and under the vehicle.
3
Use a multimeter to check for any electrical faults in the coolant temperature sensor.
4
Scan the vehicle for error codes using an OBD-II scanner to identify any related issues.
5
Inspect the coolant reservoir for cracks or damage that could cause a leak.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Socket set
•Coolant funnel
•Rags for cleanup
•Multimeter

Parts Required

•Tesla-approved coolant
•Replacement hoses (if damaged)
•Replacement coolant reservoir (if cracked)

Related Faults

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Diagnostic Steps

1
Check the coolant level in the reservoir and confirm it is below the minimum mark.
2
Inspect for visible signs of coolant leaks around the reservoir, hoses, and under the vehicle.
3
Use a multimeter to check for any electrical faults in the coolant temperature sensor.
4
Scan the vehicle for error codes using an OBD-II scanner to identify any related issues.
5
Inspect the coolant reservoir for cracks or damage that could cause a leak.

Solution

1. Preparation

Tools Required: Socket set, coolant funnel, rags for cleanup
Safety Warnings: Ensure the vehicle is turned off and cooled down before opening the coolant reservoir to avoid burns.

2. Coolant Level Check and Refill

Locate the coolant reservoir, which is typically on the front left side of the vehicle.
Remove the cap from the coolant reservoir.
Check the coolant level; if it is below the minimum mark, prepare to add coolant.
Use a funnel to pour the appropriate Tesla-approved coolant (usually a mix of propylene glycol and water).
Fill to the recommended level indicated on the reservoir.
Replace the cap securely.

3. Inspect and Repair Leaks

Examine all hoses connected to the coolant system for signs of wear or damage.
If any hose is damaged, use a socket set to remove the affected hose and replace it with a new one.
Check the coolant reservoir for cracks; if damaged, remove it using a socket set and replace it.
Inspect the connections and replace any faulty clamps or fittings.

4. System Bleeding (If Applicable)

After refilling coolant, run the vehicle in a safe area, allowing it to reach operating temperature.
Check for air bubbles in the coolant reservoir; if present, it indicates trapped air in the system.
If air is present, allow the vehicle to cool, then repeat the filling process while running the heater to help bleed air from the system.