Owners and lessees of 2018–2025 BMW G-chassis models, including the X3, X5, X7 and 5 Series, may be covered by a proposed class action alleging BMW sold them with A/C evaporator cores that corrode, leak and fail, often just after the warranty ends. No class has been certified and there is nothing to file yet.
Allegations Only · No Settlement Yet
This article describes a class action complaint. The statements below are unproven allegations. BMW of North America, LLC and Bayerische Motoren Werke AG have not been found liable, there is no certified class, and nothing to claim at this time. This page is informational and is not legal advice.
What Is This About?
A Texas owner of a 2021 BMW X5 M Competition filed a proposed class action against BMW of North America, LLC and its German parent, Bayerische Motoren Werke AG, on October 2, 2026 in the U.S. District Court for the District of New Jersey, where BMW’s U.S. arm is based. The case is Heikkila v. BMW of North America, LLC, No. 2:26-cv-12932.The complaint says the aluminum evaporator cores in the air conditioning systems of close to a million BMWs are chemically incompatible with R-1234yf, the refrigerant BMW began using across its lineup around 2017. It alleges the refrigerant can break down into an acid that eats through the evaporator’s thin aluminum tubes, causing pinhole leaks and, eventually, total A/C failure. BMW has not responded to the claims in court, and none of them have been proven.
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The Symptoms Described in the Complaint
According to the complaint, the problem typically appears at about 20,000 to 60,000 miles, often just past BMW’s four-year, 50,000-mile warranty. It describes a typical progression:- One climate zone blowing warm air while the other still cools
- A hissing sound from behind the dashboard
- A chemical smell in the cabin and oily residue on the vents
- Complete loss of air conditioning
What the Complaint Says BMW Knew
The complaint alleges BMW knew about the problem from pre-production testing, warranty and repair data, owner complaints to the National Highway Traffic Safety Administration and posts on owner forums, and technical service bulletins it sent dealers about A/C issues. It quotes a number of owner complaints describing evaporator failures at low mileage.It also alleges that around September 2024 BMW revised the evaporator core with a different protective lining, and says the dealer installed that revised part in the plaintiff’s X5. The complaint calls the change an implicit acknowledgment of a defect, and says BMW has not issued a recall, extended the warranty or offered to reimburse owners who already paid for repairs.
Who Is in the Proposed Class?
The complaint proposes a nationwide class of all people and entities in the United States who bought or leased a 2018 through 2025 BMW built on the G-chassis platform with the original aluminum evaporator core. It brings claims for breach of implied warranty under the federal Magnuson-Moss Warranty Act and New Jersey law, violation of the New Jersey Consumer Fraud Act, fraudulent concealment and unjust enrichment, and seeks compensatory and statutory damages and other relief.OCA also covers a separate suit over BMW X5, X6 and X7 front differentials.
What Happens Next?
The case is assigned to U.S. District Judge Madeline Cox Arleo. BMW has not yet answered, and the court has not ruled on whether the claims can go forward. There is no settlement, no certified class and no claim form.Questions
Which BMW models are in the A/C evaporator lawsuit?
The complaint covers 2018 through 2025 BMW vehicles built on the G-chassis platform with the original aluminum evaporator core, including but not limited to the X3, X5, X6, X7, 5 Series, 7 Series, 8 Series, M5 and M8.
What are the signs of the BMW evaporator problem described in the lawsuit?
According to the complaint, owners report one climate zone blowing warm air before the other, a hissing sound behind the dashboard, a chemical odor in the cabin, oily residue on vents, and eventually complete A/C failure, typically at about 20,000 to 60,000 miles.
Has BMW recalled the A/C evaporator?
No. The complaint says BMW has not issued a recall or an extended warranty for the evaporator. It alleges BMW revised the replacement part around September 2024 with a different protective lining without notifying earlier owners.
Is there any money to claim from the BMW A/C lawsuit?
No. There is no settlement, certified class or claim form. If the case settles or a class is certified, class members would be notified of any way to take part.
