Auto Air Conditioning

Why is my air conditioning in my car blowing hot air?

You may have low refrigerant due to other causes like loose connections, old hoses or the simple escape of refrigerant over time. These small leaks can cause your air conditioning system to stop blowing cold air.

If you are having troubles with your auto air conditioning it could be a number of reason and here are some of the parts names, so you can get familiar with them when your mechanic is speaking to you about this:

Refrigerant. The refrigerant gas used in most vehicles is commonly known as Freon or R134A. ...

Compressor. The compressor is responsible for compressing the refrigerant gas, commonly known as Freon. ...

Condenser. ...

Receiver-Drier* ...

A/C Inline Filter Kit. ...

Expansion Valve* ...

Orifice Tube* ...


Compressor: The compressor is the work horse of the air conditioning system, powered by a drive belt connected to the crankshaft of the engine. When the aircon system is turned on, the compressor pumps refrigerant vapor under high pressure to the condenser. The replacement would take the average technician approx. 2 hours of labor to perform this task, after evacuating the system of refrigerant to make sure it is not released into the atmosphere. All vehicles are different so again this will vary. And if you do not have the proper equipment to recover and recharge the system properly, do not attempt the repair, please for your safety and the environment call your trusted mechanic.


When your air conditioning is running fine here’s some suggestions for its use:

Don’t pre-cool, your car air conditioning works much better when you're actually driving, because the faster the engine turns, the faster the A/C compressor runs, which lets the system cool more effectively. Don't waste time and gas by letting your car run before you go.

If the interior is really hot, crank up the fan when you start driving, and open just the rear windows for 10 to 20 seconds. This forces all the hot air out of the cabin. Don’t open the front windows—that only moves the heat out of the front of the car, and it will leave the air in the back of the cabin hot and stagnant.

Setting to the lowest temp and adjusting the fan makes the car air conditioning more efficient, will dry out the air less, and can actually save some fuel. Why's that? In a typical A/C system, the air is cooled to 38 degrees. If you set the temp higher, you are actually forcing the system to re-heat your air, which takes more effort, burning more fuel.

If you have passengers in the back seat, turn off the recirculation mode. This takes air from the front of the cabin and pulls it back through the system, so even though everyone up front stays cool, the air in the back can get stale and hot.

If you’ve got a newer car that has an auto start/stop system, turn it off. This feature saves fuel, but it can also keep the car air conditioning compressor from running when it shuts the engine off. In very hot weather, you can begin to notice the lack of cool air very quickly, especially if you're stuck at a lengthy stoplight, or in stop-and-go traffic that's barely moving.

Get your mechanic to check your cabin air filter to make sure it’s clean. A dirty filter prevents optimal airflow.

If you have automatic climate control, lowering the temp doesn't make the car cool off faster. Most systems will do all the fan and temp adjustments automatically, so you can just set it and forget it.


A little auto air conditioning tidbit:

A company in New York City in the United States first offered installation of air conditioning for cars in 1933. Most of their customers operated limousines and luxury cars. In 1939, Packard became the first automobile manufacturer to offer an air conditioning unit in its cars.





  • Great price and service on Air Conditioning service.  Dale, the owner, checked my Jeep for pressure leaks and other problems with my air conditioning and charged a very fair price.  I have known... more

    -- Leigh S.

  • Dale at Keep Kool is one of those hard to find guys who is honest and fair. He has done a great job in repairing my vehicle. He goes over and above with customer service. I am a woman in my seventies... more

    -- Ruth C.

Recent Specials

August 26 2014
July 02 2014
June 10 2014

Recent Posts

November 05 2018
September 25 2018
August 28 2018