why does my Tesla Model S Plaid/Refresh (2021-present) make a hissing noise after turning off

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

517 words

Problem Statement

Discover the causes and solutions for hissing noise after shutdown in Tesla Model S Plaid. Step-by-step diagnostic and repair guide included.

Affected Component

Cooling System

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the 12V battery before working on electrical systems to prevent shock or short circuits.

Symptoms

•Hissing noise audible after turning off the vehicle
•Possible intermittent buzzing or clicking sounds
•No warning lights illuminated on the dashboard
•Battery cooling system operation may be active
•No performance issues during driving

Diagnostic Steps

1
Check for active cooling system operation by observing the vehicle's status via the Tesla app.
2
Inspect the vehicle logs for any alerts or notifications related to battery or thermal management.
3
Verify if the hissing noise persists in different environmental conditions (temperature, humidity).
4
Listen closely to identify the location of the noise (front, rear, or cabin).
5
Conduct a visual inspection under the vehicle for any obvious leaks or damages in cooling lines.

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
•Flashlight

Parts Required

•Tesla-approved coolant (if needed)
•Replacement hoses (if leaks are found)

Related Faults

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Diagnostic Steps

1
Check for active cooling system operation by observing the vehicle's status via the Tesla app.
2
Inspect the vehicle logs for any alerts or notifications related to battery or thermal management.
3
Verify if the hissing noise persists in different environmental conditions (temperature, humidity).
4
Listen closely to identify the location of the noise (front, rear, or cabin).
5
Conduct a visual inspection under the vehicle for any obvious leaks or damages in cooling lines.

Solution

1. Preparation

Gather tools such as a multimeter, flashlight, and OBD-II scanner (if needed).
Ensure the vehicle is parked on a flat surface and turned off.
Disconnect the 12V battery for safety if inspecting electrical components.

2. Inspect Cooling System Components

A. Locate the cooling system components:
- Open the front trunk (frunk) and locate the coolant reservoir and associated hoses.
B. Check for leaks:
- Inspect all hoses for signs of wear, cracks, or leaks.
- Use a flashlight to examine tight spaces.
C. Verify coolant level:
- Ensure the coolant level is within the recommended range. If low, top off with the appropriate Tesla-approved coolant.

3. Test Battery Management System

A. Use an OBD-II scanner:
- Connect the scanner and check for any stored error codes related to the battery management system.
B. Clear any codes found:
- If codes are present and the issue is resolved, clear the codes and monitor the system.

4. Sound Isolation

A. Use a stethoscope or similar tool:
- Carefully listen to the components while the vehicle is off to locate the source of the hissing noise.
B. Identify if it's normal operation:
- Research if similar noises have been reported by other Model S Plaid owners to determine if it is typical for the model.