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why does my Tesla Model 3 Original (2017-2023) fan keep running after turning off the car - Tesla Model 3
Home/Cars/Tesla/Model 3/Highland (2024-present)/why does my Tesla Model 3 Original (2017-2023) fan keep running after turning off the car

why does my Tesla Model 3 Original (2017-2023) fan keep running after turning off the car

Tesla Model 3 Highland (2024-present)

Error Codes
2-4 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
481 words

Problem Statement

Learn how to diagnose and fix the issue of the cooling fan running continuously after shutdown in Tesla Model 3 (2017-2023). Step-by-step guide included.

Affected Component
Cooling System
Estimated Time
2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

  • •Disconnect the battery before working on electrical components to prevent short circuits.
  • •Allow the vehicle to cool before touching components near the battery.

Symptoms

  • •Cooling fan runs continuously after vehicle shutdown
  • •Increased battery drain when parked
  • •Occasional error messages on the display
  • •Cabin temperature remains low even when vehicle is off
  • •Reduced range due to battery usage

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5

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
  • •Multimeter
  • •Socket set
  • •Screwdrivers

Parts Required

  • •Fan relay (if faulty)
  • •Battery temperature sensor (if faulty)

Additional Information

Affected Component
Cooling System
Estimated Time
2-4 hours
Difficulty
medium
Severity
medium
Tools Required
4 items
Parts Required
2 items

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Solution
1. Preparation
  • Ensure the vehicle is parked on a level surface and the power is off.
  • Disconnect the 12V battery for safety while working on the electrical components.
2. Inspect and Update Software
  • Connect the vehicle to Wi-Fi and check for available software updates in the settings menu.
  • Install any updates and restart the vehicle to see if the fan issue persists.
3. Test and Replace Fan Relay
  • Locate the main fuse box; remove the cover to access the relays.
  • Using a multimeter, test the fan relay for continuity. If it fails, replace it with a compatible relay.
  • Reassemble the fuse box cover securely.
4. Check Battery Temperature Sensors
  • Locate the battery temperature sensors (usually near the battery pack).
  • Inspect the wiring for any signs of damage or corrosion.
  • If the sensor is faulty, replace it with a new unit, following the manufacturer’s specifications.
5. Reconnect Battery
  • Reconnect the 12V battery, ensuring tight connections.
  • Power on the vehicle and verify if the fan operates normally post-shutdown.