why is my Tesla Model 3 Original (2017-2023) losing coolant

Tesla Model 3 Highland (2024-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

512 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 issues in Tesla Model 3 (2017-2023). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Cooling System

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the high voltage system before working on the cooling system.
•Allow the vehicle to cool down before inspecting the coolant system to avoid burns.

Symptoms

•Coolant reservoir low warning message
•Overheating of the battery or motor
•Puddles of coolant under the vehicle
•Sweet smell of coolant inside or around the vehicle
•Reduced performance or power limitations

Diagnostic Steps

1
Inspect the coolant reservoir and hoses for visible leaks or cracks.
2
Perform a pressure test on the cooling system to identify any hidden leaks.
3
Check the connections at the water pump and radiator for signs of coolant seepage.
4
Inspect the thermal management system for any faults using the vehicle's diagnostic tools.
5
Scan for any error codes related to the cooling system using a compatible OBD-II scanner.

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

•OBD-II scanner
•Cooling system pressure tester
•Socket set
•Torque wrench
•Screwdrivers

Parts Required

•Coolant reservoir (if damaged)
•Hoses (if cracked or leaking)
•Water pump or radiator (if faulty)

Related Faults

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Diagnostic Steps

1
Inspect the coolant reservoir and hoses for visible leaks or cracks.
2
Perform a pressure test on the cooling system to identify any hidden leaks.
3
Check the connections at the water pump and radiator for signs of coolant seepage.
4
Inspect the thermal management system for any faults using the vehicle's diagnostic tools.
5
Scan for any error codes related to the cooling system using a compatible OBD-II scanner.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is cool before starting work.
Disconnect the vehicle’s high voltage system for safety.

2. Inspect and Repair Leaks

Sub-step 1: Visually inspect the coolant reservoir and hoses for cracks or signs of wear. Replace any damaged hoses.
Sub-step 2: If leaks are found in the connections, tighten or replace the affected components.
Sub-step 3: For any visible leaks from the water pump or radiator, consider replacing these components.

3. System Pressure Test

Sub-step 1: Attach a cooling system pressure tester to the coolant reservoir cap.
Sub-step 2: Pump the tester to the recommended pressure and inspect for leaks.
Sub-step 3: If a leak is detected, follow up with repairs or replacement of the leaking component.

4. Refill Coolant

Sub-step 1: Once repairs are completed, refill the cooling system with the appropriate coolant as specified in the owner's manual.
Sub-step 2: Bleed the cooling system of air to ensure efficient operation.

5. Final Checks

Sub-step 1: Reconnect the high voltage system and power on the vehicle.
Sub-step 2: Monitor the coolant levels and check for any new leaks after a short test run.