Drivers of BMW should not have to worry about not controlling the temperature of their car, but this can happen if you have a failure of your HVAC blower. Let’s take a closer look at the HVAC blower, including what it does, reasons why it may fail, and signs to be on the lookout for, so you can contact your mechanic right away if you notice any signs of problems.

Your BMW’s HVAC Blower

HVAC is an acronym for Heating, Ventilation, and Air Conditioning. An HVAC system is any system that provides heating and cooling. Your BMW’s HVAC blower is responsible for pushing heat and air conditioning through the vents in your car.

Although this system does provide comfort to the driver and passengers through a climate-controlled vehicle, it is also vital for other areas. For instance, your vents also blow out air to defrost the windows. If you have no heat in your car, your windows will fog up from the heat of your breath, making it difficult to see and dangerous to drive. The HVAC blower helps clear your windshield.

Symptoms of an HVAC Blower failure in Your BMW

If you have any of the symptoms below, contact your trusted mechanic and make an appointment. You will want to get this fixed before it breaks completely.

  • Little or No Airflow: One of the earlier signs is that the airflow becomes much weaker than you expect. You may notice that you have to turn your blower to a higher setting than before to get the same airflow you are used to. This is one of the earliest signs of failure, and you may notice that your defrosters aren’t working correctly either.
  • Unusual noises when the fan is on: You may also hear unusual noises coming from right inside the vent. These sounds could include slapping or popping. That is usually due to an object getting sucked into the vent and now hitting against it. You may also hear a whirring noise that gets louder the further you turn the heating and cooling setting up.
  • Runs only on one speed: Once the problem exists for a little while, and it is getting worse, you may lose the number of settings it will work on. For instance, you may not be able to turn it on the highest or second-highest setting any longer. When you turn the settings up all the way, the blower does not work at all.
  • Smoke coming out of vents: Finally, you may notice smoke coming out of the vents or a bad smell. If this happens, turn the blowers off right away and pull over. Call to have your car towed for service. You should get your car thoroughly checked out before driving it again.
  • HVAC system will not work: If it stops working altogether, call your local garage to get a diagnosis. You want to make sure that this is the only problem.

Causes of HVAC Blower Failure

There are a few different reasons your HVAC blower can fail in your BMW. Check out the list below to see why your car is having issues.

  • Blower Motor Relay Malfunction: A common issue is a malfunction of the blower motor itself. The blower motor, which is inside the HVAC system, controls the function of the blower. When the electrical components fail, the HVAC motor will stop working in your BMW. When this occurs, no air will flow through your vehicle’s vents, causing you to lose all aspects of climate control.
  • Wear and Tear: Your HVAC blower is susceptible to normal wear and tear. Natural breakdown occurs over the lifespan of a vehicle. Although it is inconvenient to replace parts on your BMW, there is no way to avoid this. Through regular use, time passage, and exposure to the elements, parts wear down and break. Although many HVAC blowers last the lifetime of a vehicle, they are more prone to breaking in harsher elements. So if you live in a hot climate or somewhere where it is very cold in the winter, you may face this issue at some point.
  • Manufacturer Error: Sometimes the issue happened during the manufacturing process. Although BMW has high standards for all the vehicles they produce, mistakes still happen. A faulty component may have slipped by the inspection process and was installed into your car unbeknownst to BMW.

Contact the Pros at European Motor Works

If your car is exhibiting symptoms listed in this article, BMW AC System Service you should contact the pros at European Motor Works to look at your HVAC Blower. We serve San Francisco, CA, for all their European car needs, including service & repair.

Our vehicle technicians have 40+ years of combined experience. Our knowledge and skills will allow us to effortlessly address any vehicle repair or maintenance needs you have. So call us or stop in today!

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Attention Customers: We will be moving to a new location in the coming months to better serve you. For any questions, please call the shop: (415) 901-9405