my Toyota Corolla E170 (2013-2019) has a bad smell coming from the AC

Toyota Corolla E170 (2013-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

473 words

Problem Statement

Learn how to diagnose and fix bad smell from AC in Toyota Corolla E170 (2013-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

HVAC

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.

Symptoms

•Foul or musty odor when the AC is turned on
•Odor persists regardless of temperature setting
•Decreased airflow from the AC vents
•Occasional water pooling under the vehicle
•Increased humidity inside the vehicle

Diagnostic Steps

1
Inspect the cabin air filter for dirt or mold accumulation.
2
Check the AC drain line for blockages or leaks.
3
Use an OBD-II scanner to check for any related error codes in the HVAC system.
4
Examine the evaporator core for signs of mold or mildew.
5
Inspect the refrigerant levels to ensure no leaks are present.

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
•Flexible brush
•Compressed air

Parts Required

•New cabin air filter
•AC system cleaner

Related Faults

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Diagnostic Steps

1
Inspect the cabin air filter for dirt or mold accumulation.
2
Check the AC drain line for blockages or leaks.
3
Use an OBD-II scanner to check for any related error codes in the HVAC system.
4
Examine the evaporator core for signs of mold or mildew.
5
Inspect the refrigerant levels to ensure no leaks are present.

Solution

1. Preparation

Gather required tools and parts.
Disconnect the battery before beginning work on electrical components.

2. Replace Cabin Air Filter

Sub-steps:
1. Locate the cabin air filter compartment (usually behind the glove box).
2. Remove the screws or clips securing the glove box and gently lower it.
3. Open the air filter compartment and remove the old filter.
4. Install the new cabin air filter, ensuring proper orientation.
5. Reassemble the glove box and secure it with screws or clips.
Tools Required: Screwdriver set
Parts Required: New cabin air filter

3. Clean the Evaporator Core

Sub-steps:
1. Remove the blower motor to access the evaporator core.
2. Use an AC system cleaner spray specifically designed for evaporators.
3. Spray the cleaner into the evaporator core following the product instructions.
4. Allow the cleaner to sit as recommended, then rinse with clean water if applicable.
5. Reinstall the blower motor securely.
Tools Required: Screwdriver set
Parts Required: AC system cleaner

4. Clear the AC Drain Line

Sub-steps:
1. Locate the AC drain tube under the vehicle.
2. Use a flexible brush or compressed air to clear any blockages from the drain line.
3. Check for proper drainage by running the AC and observing if water flows out.
Tools Required: Flexible brush, compressed air
Parts Required: None