my Toyota Corolla E170 (2013-2019) exhibits strange smells when I turn on the AC, what to check?

Toyota Corolla E170 (2013-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

4 min read

605 words

Problem Statement

Learn how to diagnose and fix strange smells from the AC in your 2013-2019 Toyota Corolla E170. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

HVAC

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Allow the engine and AC components to cool down before inspection and repair.

Symptoms

•Musty or moldy odor when AC is turned on
•Sweet smell resembling antifreeze
•Burning smell indicating overheating components
•Unpleasant smell resembling rotten eggs
•Reduced airflow from the AC vents

Diagnostic Steps

1
Inspect the cabin air filter for dirt, mold, or blockage.
2
Check the AC drain for obstructions that may cause water buildup.
3
Examine the evaporator core for mold or mildew growth.
4
Scan for any refrigerant leaks using a UV light or dye.
5
Inspect the engine coolant level and hoses for leaks if a sweet smell is detected.
6
Check the blower motor and related components for any overheating issues.

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

•Flathead screwdriver
•New cabin air filter
•Coil cleaner
•Soft brush
•Vacuum
•Compressed air or flexible cleaning brush
•UV dye kit
•UV light

Parts Required

•New cabin air filter
•AC coil cleaner

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Diagnostic Steps

1
Inspect the cabin air filter for dirt, mold, or blockage.
2
Check the AC drain for obstructions that may cause water buildup.
3
Examine the evaporator core for mold or mildew growth.
4
Scan for any refrigerant leaks using a UV light or dye.
5
Inspect the engine coolant level and hoses for leaks if a sweet smell is detected.
6
Check the blower motor and related components for any overheating issues.

Solution

1. Preparation

Gather tools and materials required for the repair.
Ensure the vehicle is parked on a level surface and the engine is turned off.

2. Replace Cabin Air Filter

Tools Required: Flathead screwdriver, new cabin air filter.
Open the glove compartment and remove any contents.
Locate the cabin air filter access panel; use a flathead screwdriver to gently pry it open.
Remove the old cabin air filter and check for dirt or mold.
Install the new cabin air filter, ensuring it is oriented correctly.
Reattach the access panel and close the glove compartment.

3. Clean Evaporator Core

Tools Required: Coil cleaner, soft brush, vacuum, and access to the AC system.
Locate the access point to the evaporator core, typically behind the dash or under the hood.
Spray the coil cleaner onto the evaporator core and let it sit for the recommended time.
Use a soft brush to gently scrub any visible mold or debris.
Vacuum any debris that has loosened, ensuring that the core is clean and free-flowing.

4. Clear AC Drain

Tools Required: Compressed air or a flexible cleaning brush.
Locate the AC drain hose underneath the vehicle.
Use compressed air or a flexible brush to clear any blockages in the drain hose.
Ensure water drains freely during AC operation to prevent future musty odors.

5. Check for Refrigerant Leaks

Tools Required: UV dye kit, UV light.
If any smell suggests refrigerant leak, add a UV dye to the AC system.
Run the AC system for 15-20 minutes.
Use a UV light to inspect all AC components for visible dye leaks.