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Old 07-23-2012, 09:59 PM
mysweetx5 mysweetx5 is offline
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The BMW X5 has two fans. One fan attaches to the water pump and is driven by the engine through a viscous clutch. This fan resides behind the radiator and pulls air through it. The second fan is an electric unit that mounts in front of the radiator and pushes air through it. This is the auxiliary fan. The auxiliary fan serves two purposes. It forces air through the engine coolant radiator and automatically turns on at a low speed if the temperature of the coolant rises above a certain level. The second purpose of the auxiliary fan is to force air through the air conditioning condenser. If this fan fails in your BMW X5, pick up the replacement auxiliary fan assembly by Behr.
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