my Tesla Model 3 Original (2017-2023) is overheating during long drives, what could be wrong?

Tesla Model 3 Highland (2024-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

569 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 overheating 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

•Allow the vehicle to cool completely before working on the cooling system.
•Disconnect the battery before working on electrical components to prevent shock.

Symptoms

•Overheating warning displayed on the dashboard
•Reduced power or performance during operation
•Cooling fans running continuously even under moderate load
•Loss of regenerative braking capability
•Frequent need to pull over to cool the vehicle

Diagnostic Steps

1
Check the vehicle's temperature gauge for readings above normal operating range.
2
Use the Tesla mobile app or onboard diagnostics to check for any error codes related to the cooling system.
3
Inspect the coolant level in the reservoir; ensure it is within the recommended range.
4
Examine the coolant for signs of contamination or discoloration which may indicate a problem.
5
Inspect the cooling fans to ensure they are functioning correctly and engaging when needed.
6
Test the electric water pump operation to verify it is circulating coolant properly.

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
•Coolant tester
•Basic socket set
•Multimeter

Parts Required

•Tesla-approved coolant
•Electric water pump (if faulty)
•Coolant reservoir cap (if damaged)

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Diagnostic Steps

1
Check the vehicle's temperature gauge for readings above normal operating range.
2
Use the Tesla mobile app or onboard diagnostics to check for any error codes related to the cooling system.
3
Inspect the coolant level in the reservoir; ensure it is within the recommended range.
4
Examine the coolant for signs of contamination or discoloration which may indicate a problem.
5
Inspect the cooling fans to ensure they are functioning correctly and engaging when needed.
6
Test the electric water pump operation to verify it is circulating coolant properly.

Solution

1. Preparation

Gather tools: OBD-II scanner, coolant tester, basic socket set, multimeter.
Ensure the vehicle is parked on a level surface and the engine is cool before starting work.

2. Check Coolant Level

Open the front trunk and locate the coolant reservoir.
Use a clean cloth to wipe the area around the cap to prevent contamination.
Remove the cap and visually inspect the coolant level; top off with the appropriate Tesla-approved coolant if low.

3. Inspect Cooling Fans

Start the vehicle and let it run; observe the cooling fans’ operation.
If fans do not engage, disconnect the electrical connector and test with a multimeter for power.
If no power is present, further investigate wiring and fuses; replace faulty components as necessary.

4. Test Electric Water Pump

Locate the electric water pump; it is typically mounted near the battery pack.
Disconnect the pump's electrical connector and use a multimeter to check for voltage when the vehicle is in operation mode.
If the pump is not functioning, replace it with a new one following manufacturer specifications.

5. Flush and Replace Coolant (if contaminated)

Drain the coolant system using the drain plug located at the lowest point of the coolant loop.
Rinse the system with distilled water and drain again.
Refill with fresh Tesla-approved coolant, ensuring to bleed the system of air pockets by following the manufacturer’s procedure.