Why Won't My AC Blow Cold Air?

When you turn on the air conditioner in your car, you expect to receive a flow of fresh, cold air. However, that’s not always what happens. A number of different problems can prevent your AC from blowing cold air into the cabin, and some are more serious than others.

Potential causes of hot air

As mentioned, there are many potential causes for your AC to blow warm or hot air into the cabin rather than cold, fresh air. These include:

  • Low Refrigerant: Low refrigerant will prevent your air conditioner from operating (the clutch won’t kick in and make the compressor cycle if the amount of pressure in the system is off). This is actually the single most common problem for an AC not to blow cold. Low refrigerant can stem from a number of things, including leaks and failed components.

  • Bad Clutch Cycling Switch: If the clutch cycling switch has failed, then the electromagnetic clutch on the air compressor won’t kick in, which means that the refrigerant cannot be pressurized and the system won’t work.

  • Blocked or Broken Condenser: The condenser is where the magic happens in your air conditioner and if it has been blocked up with debris or is damaged, you won’t get cold or even cool air from the system.

  • Restrictions in the System: What happens when you kink your garden hose? The water won’t flow, right? The same is true for your car’s AC system. If there’s a restriction somewhere in the system, it blocks it all up and prevents the AC from blowing cold.

While there are several potential issues, the most common is low refrigerant. The level of refrigerant in your system decreases naturally over time (very, very slowly), but leaks can also occur. If your AC isn’t blowing cold, it must be serviced by a licensed mechanic certified for HVAC (Heating, Ventilation, and Air Conditioning) work.


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Greg

22 years of experience
333 reviews
Greg
22 years of experience
Toyota Corolla L4-1.8L - AC is not working - San Tan Valley, Arizona
Greg was very knowledgeable and shared all of the information and recommendations for my vehicle. He is personable and does a great job. Thank you Greg!
Nissan Rogue - AC is not working - Surprise, Arizona
Very happy Greg was able to come back, since he originally installed my compressor. He's honest, forthcoming, and explains exactly what he checks.and exactly what he does! I'm pleased yet again with my appointment! AND I have a/c again! Thanks so much!

John

27 years of experience
1019 reviews
John
27 years of experience
Kia Forte L4-2.0L - AC is not working - Houston, Texas
I really like this guy. He was direct, straight to the point & fairly honest about other things I already knew what was wrong with my car. I honestly felt like I could actually trust and believe In the guys integrity.
Nissan Rogue Sport - AC is not working - League City, Texas
Quick, efficient, detailed, professional. Everything you’re looking for in a mechanic! HIGHLY recommend him. Thank you so much!!

Benji

22 years of experience
277 reviews
Benji
22 years of experience
Honda Accord L4-2.4L - AC is not working - Phoenix, Arizona
Benji was running behind on his appointments. He called to give me very early notice to plan accordingly since he was 20 minutes behind. He's super friendly, knowledgeable, and a pleasure to work it. I would work with Benji again for my auto needs and recommend him to people I know.
GMC Yukon - AC is not working - Chandler, Arizona
On time, friendly, and professional. Gave thorough explanation of findings and answered all my questions - I would not hesitate in recommending Benji to anyone.

Peter

25 years of experience
514 reviews
Peter
25 years of experience
Toyota Matrix L4-1.8L - AC is not working - Los Angeles, California
Peter was incredibly detailed and was able to diagnose and fix my AC issue. As a new car owner, 10/10 I would hire Peter again to help diagnose and fix the issues on my Toyota. Thank you!!!
Ford Taurus - AC is not working - Granada Hills, California
Great experience! Peter lives close by and contact me to see if he could come by a day early at the end of his day. He made the repair, gave me instructions on what to look for in the future and all took 30 minutes.

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