Q: Radiator fan very loud 2012 BMW X5

asked by on

For some reason, every time I turn on the ventilation system for the cabin, the radiator fan goes on and off constantly and in one instance I got a warning on the iDrive screen that the engine is overheating. It went away after a few minutes of turning the engine off and it drives fine, but we keep hearing the radiator fan go on and off very loudly.

My car has 50000 miles.
My car has an automatic transmission.

Hello - for virtually all modern cars, setting the heater/AC controls on any position that utilizes the air conditioning compressor (i.e. defrost), the auxiliary fan for the radiator is automatically turned on to increase airflow over the AC condenser coil (in front of the radiator). Your BMW does the same. The "overheat" warning, however, is not normal, and should be checked out - even if it is only a bad sensor. I would recommend a cooling system inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Radiator fan very loud 2012 BMW X5

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Why wont the fan start? Smoking near fan, cooling fan new but wont start. engine overheats.

Hey there. As you alluded, this is a sign of a bad cooling fan relay switch. The cooling fan relay switch comes on when the temperature reaches a certain level to help cool down the radiator. When this is faulty,...

Q: Pinking rattles when accelerating

Hello there, thank you for asking about your 2003 BMW 760Li. Spark knock, or pinging, can result from excessive carbon build up. There is a technical service bulletin (TSB) regarding this condition for your vehicle: SI B 11 11 06....

Q: Q: Coolant leaking from car

Coolant can leak from many places. The radiator, hoses, thermostat housing, freeze plugs, water pump, and heater core for example are all places that are common for coolant to leak from. The leak usually gets worse after the car is...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...