2021-2022 Toyota HVAC Drain Obstruction TSB

Symptoms

Owners of affected Toyota vehicles may notice issues with their HVAC system, particularly if the evaporator drain hose becomes obstructed. This obstruction is commonly caused by insect nests. Symptoms can include:

• Reduced air conditioning performance.
• Water leaking inside the vehicle, often from under the dashboard.
• Unpleasant odors from the HVAC system due to stagnant water.

Diagnosis / Trigger Conditions

This condition primarily affects vehicles in specific geographic areas where insect activity is prevalent. The root cause is an insect nest blocking the HVAC evaporator drain hose, preventing proper drainage of condensation.

Repair Procedure Summary

Toyota's Technical Service Bulletin (TSB) 10201400 outlines a solution to minimize future occurrences of this environmental condition. The primary remedy involves the installation of an insect repellent drain hose tip, known as the ARINIX® Tip.

For some models, a new drain hose may be required to ensure the ARINIX® Tip fits correctly. The bulletin provides detailed procedures for the proper handling and installation of this optional service part by technicians.

Required Tools or Parts

To address the HVAC evaporator drain hose obstruction, the following parts may be utilized:

• ARINIX® Tip: An insect repellent drain hose tip designed to prevent insect nests.
• New Drain Hose: Potentially required for certain models to ensure proper fitment of the ARINIX® Tip.

Owner Action

If you own a 2021-2022 Toyota Camry or another affected model and are experiencing issues such as water leaks or poor AC performance that might be related to an HVAC drain obstruction, it is recommended to consult your authorized Toyota dealership. You can inquire about the ARINIX® Tip as an optional service part to help prevent future insect nest obstructions in the HVAC evaporator drain hose. Addressing a Toyota Camry HVAC drain obstruction proactively can prevent more significant issues.

Source: NHTSA ID 10201400