BMW X5 overheating issue with fan running continuously despite replacing cooling sensor and thermostat on BMW X5

Submitted by Vehicle Owner · Mar 26, 2026
Published by RepairPal

Problem overview

Some BMW X5 owners report experiencing overheating issues even after replacing the cooling sensor and thermostat. These problems may stem from a faulty radiator fan, which can either run continuously or not operate at all, leading to inadequate engine cooling. Additionally, issues with the fan control module or relay can cause the fan to malfunction, disrupting its operation based on engine temperature. Wiring problems are also reported, where faulty connections can prevent signals from reaching the fan or cause erratic behavior. Some owners have noted that a leak in the AC condenser can result in the radiator fan running at high speeds constantly, necessitating repairs to address the leak. Furthermore, certain BMW X5 models may have additional cooling system components, such as water pumps or charge air coolers, that can affect overall cooling performance. It is recommended for owners facing these issues to consult a qualified mechanic or BMW specialist for a thorough inspection and effective resolution.

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BMW X5 vehicles with this problem

1 model year affected

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