Some BMW X5 owners report experiencing a knocking noise on the driver's side after replacing the water pump, oil, spark plugs, and coils. This noise may be attributed to several factors, including worn-out suspension components such as bushings, control arms, or stabilizer links. Additionally, issues with engine components, like incorrect ignition timing or worn spark plugs, can also lead to knocking sounds. Owners should ensure that the water pump was installed correctly to avoid leaks or malfunctions, and using the correct type and amount of oil is crucial to prevent further engine knocking. Furthermore, proper installation of coils and spark plugs is necessary to maintain engine performance. If the knocking persists, it is recommended to have the vehicle inspected by a qualified mechanic for a thorough diagnosis and resolution.

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.