why does my Toyota Corolla E170 (2013-2019) air conditioning smell like mildew

Toyota Corolla E170 (2013-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

526 words

Problem Statement

Learn how to diagnose and fix mildew smell in the AC system of your Toyota Corolla E170 (2013-2019). Step-by-step guide with symptoms and solutions.

Affected Component

HVAC

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Ensure the vehicle is turned off and cool before beginning the repair process.

Symptoms

•Musty or mildew smell when the air conditioning is operating
•Reduced airflow from the vents
•Increased humidity inside the vehicle
•Possible fogging of windows
•Occasional hissing or popping noises from the AC system

Diagnostic Steps

1
Inspect the cabin air filter for dirt or mold accumulation.
2
Check for any visible signs of moisture or mold in the AC evaporator case.
3
Examine the drainage tube for clogs or blockages.
4
Use an OBD-II scanner to check for any HVAC-related error codes.
5
Test the operation of the AC system to ensure it is cycling 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

•Screwdriver set
•Compressed air (optional)
•AC cleaner or disinfectant spray

Parts Required

•Cabin air filter
•AC evaporator cleaner (if necessary)

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Diagnostic Steps

1
Inspect the cabin air filter for dirt or mold accumulation.
2
Check for any visible signs of moisture or mold in the AC evaporator case.
3
Examine the drainage tube for clogs or blockages.
4
Use an OBD-II scanner to check for any HVAC-related error codes.
5
Test the operation of the AC system to ensure it is cycling properly.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to ensure safety.
Park the vehicle in a well-ventilated area.

2. Remove Cabin Air Filter

Locate the cabin air filter housing, typically found behind the glove box.
Open the glove box and remove any contents.
Unclip or unscrew the glove box to gain access to the filter housing.
Remove the old cabin air filter and inspect for mold or dirt.

3. Clean the AC Evaporator

If accessible, spray an AC cleaner or disinfectant into the evaporator case through the drain hole.
Allow it to sit for the recommended time as per product instructions.
If the evaporator is heavily contaminated, consider removing the dashboard for more thorough cleaning.

4. Clear the Drainage Tube

Locate the AC drainage tube under the vehicle.
Check for clogs and use compressed air or a flexible wire to clear any blockages.
Ensure that the tube is draining properly when the AC is in use.

5. Install New Cabin Air Filter

Insert a new cabin air filter into the housing, ensuring it is oriented correctly.
Reattach the glove box and secure it in place.

6. Final Steps

Reconnect the battery.
Turn on the AC system to the highest setting to facilitate airflow and help evaporate any remaining moisture.