There’s no doubt that air conditioning makes our lives a lot easier and more comfortable, especially during the warmer months of the year. BMWs are one of the fewer cars on the market that offer drivers exceptional cabin climate control at their fingertips; however, when the HVAC blower in your BMW begins to fail, you might start noticing some disheartening symptoms of malfunction. Just like all the other parts and systems within your BMW, the HVAC system also requires ongoing care and maintenance in order to function properly year round. Properly diagnosing the source of the HVAC problem is critical, which is why hiring a BMW specialist is the first and most important step toward remedying the issue.
When you take your car in to a BMW expert, they will follow a diagnostic protocol to isolate the cause of the problem, which may be unique to the car itself, and find a solution and method of treatment that often involves BMW-specific replacement parts and skill. If you begin to notice problems with the HVAC system in your BMW, it’s also critical to be able to recognize the symptoms and follow through with the next steps for care. In this article, we’ll go over the most typical signs of HVAC issues, including blower failure, and what you and your BMW specialist can do to diagnose the problem accurately.
Isolating the Cause of the Issue
Performing a differential diagnosis on your HVAC system is a critical first step in the treatment process. Assessing where the issue originates will help your BMW specialist find the best course of action to repairing and restoring the HVAC system to its original capacity. If your HVAC system is experiencing problems, ask yourself the following list of questions to determine if the problem lies with the HVAC blower:
Is any air being blown out of the vents?
First, turn the air power knob steadily up to the highest setting, pausing at each setting along the way. There should be a gradual increase in airflow, with the highest setting being the strongest. If you notice that the airflow is diminished, or no air is released at all, the problem is likely due to an electrical issue and not the HVAC blower itself.
What is the temperature of the air coming out of the vents?
When you turn on the heater, the AC, or the defrost setting, the air temperature should differ significantly. If there is no temperature difference between the settings, you might have a refrigerant leak on your hands. Freon is responsible for making the air cool on the air conditioning setting, and if it leaks, it cannot circulate properly through the AC system.
Is the airflow consistent and strong?
Finally, if you notice that no significant airflow is released from the vents, it’s important to differentiate between electrical issues and HVAC blower failure as the source of the issue. Especially when the airflow is miniscule, but not completely diminished, the HVAC blower is usually the culprit.
The Potential Causes of HVAC Blower Failure
There are several different possible causes of HVAC blower failure; therefore it is critical to find a BMW professional who is familiar with related symptoms, causes, and treatment protocols. Here are the two most frequent causes of HVAC blower failure:
Bad blower motor relay
The blower motor relay is the electrical component responsible for providing power to the HVAC blower. Without a proper-working blower motor, the air cannot properly flow through the vents in your cabin. Electrical problems are a common cause of blower motor failure.
Age and Wear
As your BMW accumulates mileage, it’s normal for parts begin to wear out and require replacement. The blower motor itself might wear out due to excessive wear, exacerbated by infrequent maintenance services. To prevent such issues, follow your recommended service plan set forth by the BMW manufacturer.
How Auto Europa can help
Maintaining a BMW takes skill, expertise, and the right connections. Here at Auto Europa, located in San Francisco, CA, our certified technicians have accurately diagnosed and treated HVAC blower motor failure in countless BMW cars over the years. Since 1992 and specializing in BMW cars, among other imports, we’ve remained San Francisco’s leading European automotive repair shop. To learn more about our shop or to schedule an inspection of your HVAC system, please contact us right away. As your specialist of choice, we look forward to keeping your BMW in optimal condition all year long.