how to check for coolant leaks in Tesla Model S Original (2012-2020)

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

474 words

Problem Statement

Learn how to check for coolant leaks in Tesla Model S (2012-2020). Step-by-step diagnostic and repair guide with essential tools and tips.

Affected Component

Cooling System

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Allow the engine to cool completely before performing any checks on the cooling system.
•Disconnect the high-voltage battery if you are working near electrical components.

Symptoms

•Coolant warning light illuminated on the dashboard
•Visible puddles or spots of coolant under the vehicle
•Sweet smell of coolant inside the cabin
•Decreased cabin heating performance
•Frequent topping off of coolant reservoir

Diagnostic Steps

1
Inspect the coolant reservoir for cracks or damage.
2
Examine hoses and connections for signs of wetness or corrosion.
3
Check the undercarriage for coolant stains or drips.
4
Pressurize the cooling system using a cooling system pressure tester.
5
Monitor the temperature gauge for unusual fluctuations during operation.
6
Use a UV dye added to the coolant and inspect with a UV light for leaks.

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

•Cooling system pressure tester
•UV dye
•UV light
•Flashlight
•Funnel

Parts Required

•Replacement coolant reservoir (if damaged)
•Replacement coolant hoses (if found damaged)

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Diagnostic Steps

1
Inspect the coolant reservoir for cracks or damage.
2
Examine hoses and connections for signs of wetness or corrosion.
3
Check the undercarriage for coolant stains or drips.
4
Pressurize the cooling system using a cooling system pressure tester.
5
Monitor the temperature gauge for unusual fluctuations during operation.
6
Use a UV dye added to the coolant and inspect with a UV light for leaks.

Solution

1. Preparation

Tools Required: Cooling system pressure tester, UV dye, UV light, flashlight, funnel
Ensure the vehicle is on a level surface and the engine is cool.
Disconnect the high-voltage battery if necessary for safety.

2. Inspect Coolant Reservoir

Locate the coolant reservoir.
Check for visible cracks or leaks.
If damaged, replace the reservoir.

3. Examine Hoses and Connections

Visually inspect all coolant hoses for signs of wear, cracks, or leaks.
Ensure all connections are tight and secure.
Replace any damaged hoses or clamps.

4. Pressurize the Cooling System

Attach the cooling system pressure tester to the coolant reservoir.
Pump the tester to the recommended pressure (usually around 15 psi).
Observe for any drop in pressure which indicates a leak.
Look for leaks around the hoses, radiator, and thermostat housing.

5. Use UV Dye for Detection

If no leaks are found using the previous steps, add UV dye to the coolant reservoir.
Run the vehicle until it reaches operating temperature.
Use a UV light to scan the engine bay and undercarriage for leaks. The dye will glow under UV light, revealing the leak's location.