Why Won't My AC Blow Cold Air?

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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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Recent AC is not working Inspection reviews

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YourMechanic AC is not working Inspection Service

Average Rating

4.8/5

Number of Reviews

879

Rating Summary
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Honorio

18 years of experience
805 reviews
Honorio
18 years of experience
Nissan Altima - AC is not working - San Jose, California
Honorio was such an amazing mechanic. He is super smart and knowledgeable about what he’s doing. You don’t have to second guess him twice. Th way he puts so much effort into his work you would think he’s fixing his own car. He really cares and wants to do the best possible job. He is an amazing mechanic and will definitely be booking him from now on.
Ford Mustang - AC is not working - Los Altos, California
Honorio, was a Star, will be looking to book him for follow up work after my AC diagnoses, refill and ID of the main problem. More than 5 stars if that were possible

Joe

42 years of experience
735 reviews
Joe
42 years of experience
BMW 740i - AC is not working - Saint Petersburg, Florida
Great guy. Knows his stuff and easy to work with. Very friendly and helpful. Knows BMW and that’s important to me. Highly recommend.
Honda Odyssey - AC is not working - Tampa, Florida
As expected - Joe was great. Insightful, helpful and explained everything. Will book again without hesitation.

Brian

22 years of experience
329 reviews
Brian
22 years of experience
Honda Odyssey - AC is not working - Jacksonville, Florida
Very knowledgeable and courteous. He was able to quickly diagnose the problem and tell us how to fix it! Thanks Brian!!
Nissan Rogue - AC is not working - Jacksonville, Florida
Amazing service!!! Brian was timely, professional, informative, and this service is just SO convenient. This was my 2nd time booking with Brian via Yourmechanic.com and it wont be my last!!

James

29 years of experience
644 reviews
James
29 years of experience
Hyundai Santa Fe - AC is not working - Orlando, Florida
James was super friendly and very helpful in diagnosing the issues with my A/C. Plan to book him again in the future!
Volkswagen Jetta - AC is not working - Lake Mary, Florida
James did an excellent job as usual. He was able to determine what was wrong with my car nad provided good options.

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