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Why Is My Car’s Air Conditioning Blowing Hot Air?



There’s nothing quite like cooling off by sitting in front of an air conditioning unit, especially when traveling in and around Bedford, Manchester, and Merrimack, NH, during those warmer months. Turning on your car’s A/C, expecting a refreshing burst of air, only to be met with hot air is an unsettling experience.

For those drivers asking, “Why is my car’s air conditioning blowing hot air”, we have the answer for you. At Ira Lexus of Manchester, we’ve created this A/C guide to help. Continue reading to learn more and don’t hesitate to contact us with questions. Skip ahead to schedule your automotive service online here!

Why Is My Car’s Air Conditioning Blowing Hot Air?

How Does an A/C System Work?

Many drivers assume your car’s air conditioning system works by creating and blowing cold air into the cabin. While this is somewhat true, the truth is a far more in-depth process.

In a nutshell, your car’s air conditioning works by cooling the air and removing moisture from it rather than creating new, cold air. This process includes refrigerant, a compressor, a condenser, and more.

With all these parts that go into cooling your cabin, there could be lots of different reasons your car is blowing hot air. Let’s check out three reasons why this may be happening.

Three Reasons Your Air Conditioning Is Blowing Hot Air

1). Refrigerant Is Leaking

Refrigerant is responsible for flowing through the compressor and the hoses, expanding and contracting as it removes heat and moisture from the air. This is often the cause for blowing hot air since the rest of the air conditioning system can’t properly function without enough refrigerant.

A leak can occur when the connecting hoses are punctured or the evaporator is rusted. Either way, the refrigerant can leak, causing the levels to drop and resulting in hot air when the A/C is turned on.

AC Service

2). Worn Condenser or Compressor

Both the condenser and the compressor play vital roles in cooling your cabin.

  • Compressor: A compressor is responsible for turning the refrigerant liquid into a gas, then pumping this gas through the air conditioning system.
  • Condenser: The role of the condenser is to pull the heat and moisture from your cabin, then allow the refrigerant to absorb this heat to cool the cabin.

Either the compressor or the condenser can wear over time, leaving hot air to flow through the cabin instead of cold air.

3). Issues With Electrical System

Another possible reason your car is blowing hot air is because of issues with your vehicle’s electrical system. Frayed wires and blown fuses are just some of the reasons your car may run into electrical issues.

How does this affect your air conditioning? When there’s an issue with the electrical system, it’s built into your car to shut down the system to prevent further damage.

What To Do if Your Car’s Blowing Hot Air?

Don’t let yourself sweat while traveling. At the first sign of hot air coming out of your air conditioning system, bring your vehicle to your trusted service center, like ours at Ira Lexus of Manchester. Here, our team of Lexus factory-trained and -certified technicians will quickly diagnose the cause for hot air, then take the necessary steps to resolve the situation.

With their help, you’ll be back to cruising in and around Bedford, Manchester, and Merrimack, New Hampshire, with cold air in no time. Don’t wait—schedule your service appointment with us today!

Ira Lexus of Manchester 42.955522, -71.481662.