my Toyota Corolla E170 (2013-2019) has a bad smell coming from the vents, what's wrong

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the battery if working on electrical components.

2. Replace Cabin Air Filter

• Sub-steps:
  1. Open the glove compartment and remove any contents.
  2. Locate the cabin air filter access panel behind the glove compartment.
  3. Remove the access panel by unscrewing or unclipping it.
  4. Take out the old cabin air filter and inspect it for dirt and mold.
  5. Install the new cabin air filter, ensuring it is oriented correctly (check airflow direction).
  6. Reattach the access panel and close the glove compartment.

3. Clean HVAC System

• Sub-steps:
  1. Remove the blower motor (if necessary) to access the evaporator core.
  2. Use a cleaning solution designed for HVAC systems (like an evaporator cleaner) and apply it to the evaporator core and surrounding areas.
  3. Allow the cleaner to sit for the recommended time, then rinse it off if applicable.
  4. Reinstall the blower motor and any components removed during cleaning.

4. Clear Drain Tube

• Sub-steps:
  1. Locate the drain tube under the vehicle, usually positioned near the firewall.
  2. Inspect the drain tube for any blockages or clogs.
  3. Use compressed air or a flexible brush to clear any debris from the drain tube.
  4. Ensure that the tube is reconnected securely to prevent future clogs.

Tools Required:

• OBD-II scanner
• Screwdriver set
• Compressed air or flexible brush
• HVAC cleaning solution
• Replacement cabin air filter

Parts Required:

• Cabin air filter
• HVAC cleaning solution

Estimated Repair Time: 1-2 hours

Safety Warnings:

• Disconnect battery before working on electrical components.
• Allow the engine to cool before performing any inspections near the HVAC system.