BMW X3 A/C not cooling properly, possible evaporator or O-ring issue on BMW X3

Submitted by texasx3driver · Aug 23, 2025
Published by RepairPal

Problem overview

Some BMW X3 owners report experiencing air conditioning issues, such as inadequate cooling, which may stem from problems like evaporator leaks or deteriorating O-ring seals. These evaporator leaks can result in refrigerant loss, significantly reducing cooling efficiency, and if diagnosed by a dealer, they may be the root cause of the AC malfunction. Additionally, leaking O-ring seals are a common culprit for refrigerant leaks in the AC system, as they can deteriorate over time. To accurately identify the source of a refrigerant leak, some owners utilize a method involving fluorescent dye, which helps highlight the leaking component under UV light. It is recommended that owners consult a professional mechanic for diagnosis and repair to avoid complications that may arise from DIY attempts.

53 people reported this problem
23 comments
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BMW X3 vehicles with this problem

Average mileage: 94,521 miles
(170 - 190,200)

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