why does my Tesla Outback have a strange smell when I turn on the heater?

Subaru Outback 5th Generation (2015-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

549 words

Problem Statement

Learn how to diagnose and fix strange smells when the heater is activated in your Tesla Outback. Step-by-step guide with symptoms and solutions.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems
•Allow the engine to cool before inspecting the heater core or coolant system

Symptoms

•Unpleasant or burnt smell when the heater is turned on
•Possible difficulty in adjusting the heater settings
•Noticeable odor inside the cabin that intensifies with heater operation
•Possible presence of visible smoke or haze coming from the vents
•HVAC system not performing effectively (i.e., weak airflow)

Diagnostic Steps

1
Inspect the cabin air filter for dirt or debris buildup
2
Check the heater core for leaks or contamination
3
Examine the ductwork for foreign objects or mold growth
4
Scan for any trouble codes using an OBD-II scanner
5
Assess the condition of the heater blower motor for unusual noises
6
Inspect the coolant level and check for any signs of contamination

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
•Socket set
•Vacuum cleaner
•Cleaning brushes
•Coolant flush kit

Parts Required

•Cabin air filter
•Heater core (if replacement is necessary)
•Blower motor (if replacement is necessary)

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Symptoms

•Unpleasant or burnt smell when the heater is turned on

•Possible difficulty in adjusting the heater settings

•Noticeable odor inside the cabin that intensifies with heater operation

•Possible presence of visible smoke or haze coming from the vents

•HVAC system not performing effectively (i.e., weak airflow)

Diagnostic Steps

1
Inspect the cabin air filter for dirt or debris buildup
2
Check the heater core for leaks or contamination
3
Examine the ductwork for foreign objects or mold growth
4
Scan for any trouble codes using an OBD-II scanner
5
Assess the condition of the heater blower motor for unusual noises
6
Inspect the coolant level and check for any signs of contamination

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the vehicle's battery to ensure safety during repairs.

2. Replace Cabin Air Filter

Locate the cabin air filter housing, typically found behind the glove compartment.
Remove the glove compartment (if necessary) to access the filter.
Take out the old cabin air filter and inspect for dirt or damage.
Install a new cabin air filter, ensuring it is positioned correctly.
Reassemble the glove compartment.

3. Inspect and Flush Heater Core

Locate the heater core hoses in the engine bay.
Disconnect the hoses carefully using a socket set.
Use a coolant flush kit to clean the heater core; run the flush solution through the core until clear.
Reconnect the hoses and ensure they are secure.

4. Clean Ductwork

Remove the dashboard panel to access the HVAC ducting.
Use a vacuum and a cleaning brush to remove any debris or mold present in the ducts.
Optionally, apply a disinfectant spray to eliminate odors and bacteria.

5. Check and Replace Blower Motor (if necessary)

Access the blower motor, usually located under the dashboard on the passenger side.
Disconnect the electrical connector and remove the mounting screws.
Inspect for damage or wear; replace with a new blower motor if necessary.
Reconnect the electrical connector and test operation.