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March 18, 2026 Service bulletin

Condition in which the air conditioner does not cool due to a leak and/or corrosion in the rear underbody...

Toyota technical service bulletin T-SB-0021-26 for 2020-2024 Toyota Highlander and 2020-2024 Toyota Highlander Hybrid.

Bulletin number
T-SB-0021-26 (T-SB-0021-26)
Component
Electrical system
Summary
Some 2020 – 2024 model year Highlander and Highlander Hybrid vehicles may exhibit a condition in which the air conditioner does not cool due to a leak and/or corrosion in the rear underbody air conditioner tube and accessory assembly. The anti-corrosion material has been updated to reduce the possibility of this condition.

Owners of these vehicles have filed 91 complaints in the electrical category.

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