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425 Providence Hwy, Westwood, MA, 02090

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Dealership Info

Phone Numbers:Sales Hours:
  • Mon - Thu9:00 AM - 7:00 PM
  • Fri - Sat9:00 AM - 6:00 PM
  • SunClosed
Service Hours:
  • Mon - Thu7:00 AM - 7:00 PM
  • Fri7:00 AM - 6:00 PM
  • Sat8:00 AM - 4:00 PM
  • SunClosed
Parts Hours:
  • Mon - Fri7:00 AM - 6:00 PM
  • Sat8:00 AM - 4:00 PM
  • SunClosed

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Why Is My Car AC Blowing Hot Air

If you find yourself wondering, "Why is my car AC blowing hot air?" and if you're located in Westwood, Dedham, or Needham, MA, you're not alone in facing this issue. Our experts at Mercedes-Benz of Westwood are here to explain the most common reasons, how to keep your AC working at its best, and what to do if you need a repair. 


Issues with the Electrical System

Your vehicle's AC relies on a complex electrical system, and when it starts blowing hot air, a malfunction in this system might be the culprit. If any component, such as fuses, relays, or switches, fails to function properly, the entire electrical system can shut down.  

The solution to this problem involves seeking the expertise of a reliable mechanic, as diagnosing and fixing electrical issues requires a thorough inspection of the fuse box and wiring. 

Low Refrigerant Levels or Leaks


Refrigerant, also known as coolant, circulates through the AC system, removing heat from the cabin. If you notice a pong in your garage or your refrigerant levels are low, this may indicate a leak. In that case, it’s important to take your car to our trusted service center and let our expert technicians diagnose and address the issue promptly. 


Faulty Condenser


The condenser plays a crucial role in cooling the refrigerant, but it can be compromised by road debris, leading to blockages or breakages. Sometimes, this can be fixed by removing debris from the grille, but if the issue persists, taking your car to a service center is advisable. 


Broken Compressor

The AC compressor pressurizes and circulates refrigerant, and it can fail because of wear and tear or inactivity during long winters. Regular use or activation under the defrost setting in newer vehicles can prevent compressor problems. 

Other Reasons for AC Issues


While previous reasons are the most common, there are also other reasons why your car's AC is blowing hot air. One of them may be that your cooling fans are broken and, therefore, not removing heat from the refrigerant. 

Another reason could be a dirty air filter. In that case, you may also notice your car stuttering or jerking when accelerating. 


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How Do I Keep My AC Running at Its Best?

The first step toward keeping your car AC working as it should is by following routine maintenance such as filter repairs and electric system inspections. Another good tip is turning your air conditioner on once a month to prevent damage to the compressor. 

If your AC is already having issues, the best way to go is by visiting a trusted service center near you. Our service center at Mercedes-Benz of Westwood in Westwood, Dedham, and Needham, MA, is equipped with skilled technicians who specialize in diagnosing and resolving air conditioning problems. Whether it's an electrical issue, low refrigerant, a faulty condenser, a broken compressor, or other concerns like broken cooling fans or a dirty air filter, we have the expertise to provide effective solutions. 


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How Do I Keep My AC Running at Its Best?

Trust our Mercedes-Benz of Westwood Service Center for expert solutions. Our team is dedicated to diagnosing and repairing issues with your vehicle's air conditioning, ensuring you can enjoy a cool and comfortable ride regardless of the weather. 

You can also contact us or stop by our showroom near Westwood, Dedham, or Needham, Massachusetts, if you have further questions about why is my car AC blowing hot air. Schedule your service today! 


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Mercedes-Benz of Westwood 42.213508, -71.182131.