My Car A/C is Blowing Hot Air - The Truth About Cars - Navara

My Car A/C is Blowing Hot Air

My car ac is blowing hot air supposed to be car air conditioning blows cold air instead of hot air. What seems to be a problem, let's take a look first on some parts of the car air conditioning system to have a little background. 


Air conditioning system has what it calls the “Refrigerant”, a substance that is considered as the lifeblood of the car air conditioning. The refrigerant is the one that absorbed the heat from the car passenger compartment with the help of what is called the evaporator, of course when the heat is absorbed on one area that area will become cold, just like what happens to the car passenger compartment in which becomes cooler.

Once the refrigerant absorbed heat, it will become hot and it changes its form from the liquid into gas, this gas will then passes into a part called compressor, this part served as the heart of the system. The gas will then be compressed and passes into the condenser to cools down and return to its liquid form so that it can absorb heat again. This is a repeated cycle that your car air conditioning system does.

Now, let’s go back to the problem. When the air conditioning blows hot air this only means that the refrigerant does not absorb the heat coming from the passenger compartment and it only happens when there is no refrigerant that passes into the evaporator. With that said the most likely reasons why there is no refrigerant on the system is that it has a leak somewhere on the system or the condenser is clogged.

Of the two reasons stated above, a clogged condenser is only a contributing factor the main problem is a refrigerant leak.

Possible cause of car A/C blowing hot air

A refrigerant leak or clogged condenser

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How to fix a car air conditioning blowing hot air

The first thing to do when having this kind of problem is to check the condenser for any debris, dirt or bug that is build up outside the condenser. The condenser is usually found mounted in front of the radiator. Try cleaning the condenser with a soft brush and spray with pressurized water to remove the debris that blocks the air to pass through the condenser to cool the refrigerant. This will improve the performance of your car air conditioning system.

After cleaning if there is still a problem, then the possibility is there is a leak somewhere in the system. Bring the car to a reputable auto shop that specializes in car air conditioning system. Ask the mechanic to check for leak then repair if necessary. Take note that a clogged condenser is just a contributing factor why the car air conditioning blows hot air. The main problem is a refrigerant leak in which you need to replenish the system with enough amount of refrigerant after the leak is repaired.

All new cars use a different type of refrigerant these days compared to old cars, cars now use R134a refrigerants which is environment-friendly. Old cars use R12 refrigerants which are already banned because of its hazardous effect on the environment. If your car still uses R12 refrigerant it would be better to ask your mechanic to convert your car air conditioning system to the one that is cheaper and environment-friendly refrigerants like the R134a.

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