why is my Tesla Model S Original (2012-2020) losing coolant

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

3-5 hours

Time

medium

Difficulty

high

Severity

3 min read

534 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

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

Affected Component

Cooling System

Estimated Time

3-5 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before opening any cooling system components to prevent burns.

Symptoms

•Coolant warning light illuminated on the dashboard
•Low coolant level in the reservoir
•Sweet smell of coolant near the vehicle
•Visible coolant puddles or stains under the vehicle
•Overheating of the battery or motor during operation
•Reduced performance or power limit warnings

Diagnostic Steps

1
Inspect the coolant reservoir for cracks or leaks.
2
Check the hoses connected to the coolant system for signs of wear or damage.
3
Use a UV dye and blacklight to detect leaks in the cooling system.
4
Examine the radiator and any associated components for signs of leaks.
5
Perform a pressure test on the cooling system to identify leaks.
6
Check the water pump operation and any seals for failure.

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
•Hose clamp pliers
•Torque wrench
•Coolant catch pan
•Funnel

Parts Required

•Replacement hoses
•New water pump
•Coolant (as per manufacturer specifications)

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Diagnostic Steps

1
Inspect the coolant reservoir for cracks or leaks.
2
Check the hoses connected to the coolant system for signs of wear or damage.
3
Use a UV dye and blacklight to detect leaks in the cooling system.
4
Examine the radiator and any associated components for signs of leaks.
5
Perform a pressure test on the cooling system to identify leaks.
6
Check the water pump operation and any seals for failure.

Solution

1. Preparation

Gather the necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the negative terminal of the 12V battery.

2. Inspect and Replace Leaking Hoses

Tools Required: Socket set, hose clamp pliers.
Inspect each hose connected to the cooling system for cracks or leaks.
If any hoses are damaged, use hose clamp pliers to remove the old hose.
Install new hoses, ensuring they are securely attached and clamped.

3. Replace Faulty Water Pump

Tools Required: Socket set, torque wrench, coolant catch pan.
Remove any covers obstructing access to the water pump.
Disconnect the electrical connector and coolant hoses from the pump.
Unbolt the water pump from its mounting bracket and remove it.
Install the new water pump, ensuring to torque the bolts to the manufacturer's specifications.
Reconnect coolant hoses and the electrical connector.

4. Coolant Replacement

Tools Required: Coolant catch pan, funnel.
Drain the old coolant into a catch pan.
Refill the system with the recommended coolant mixture as specified in the owner's manual.
Bleed the cooling system to remove air pockets.

5. Reconnect Battery and Test

Reconnect the negative terminal of the 12V battery.
Start the vehicle and allow it to reach operating temperature while monitoring for leaks.
Check coolant levels again and adjust if necessary.