Category: A/C system leaks

ac temperature out of the vents

How often does an AC system need to get recharged?


The A/C system in your car is a closed sealed system. It may never need to be recharged. The refrigerant inside the system is pressurized by the hvac compressor ,recirculated and reused in a closed loop infinite system. The Freon(refrigerant) will change from vapor to liquid and back constantly for as long as the system is running.

The R-134a/R-1234yf install in your car is in charge of moving the unwanted elevated temperature of one room or space (the cabin inside your car ) to the outside ambient temperature where it has no impact. To accomplish this task properly a factory calculated range amount of refrigerant needs to be running inside the system.

You need to get your AC system recharged as soon as the total amount of refrigerant is too low to carry the heat from inside your car’s cabin to the outside of the vehicle.

100 % sealed air conditioning system does not exist. All a/c systems leak, and this condition is taken into consideration when the a/c charge amount is calculated when designing the system. Some amount of refrigerant loss could develop over time, but it is a minute amount, and it should not affect system operation.

How do I know if my ac in my car needs to be recharged ?

There is not a periodic service interval that you need to follow to recharge your air conditioning system. This service is system dependent, meaning every car will have unique needs for freon(refrigerant) recharge.

The first sign that could indicate that you need to recharge the refrigerant in your car’s ac system is when the system begins to cool less than it used to.


  • Poor A/C performance. A/C not cooling down the vehicle
  • One Side of the car cooling more than the other side.
  • Back of the car cooling more than the front.
  • A/C compressor short cycling. A/C compressor turning on and off fast.
  • Frost in a/c lines.
  • Visible refrigerant (Freon) leaks.


Low refrigerant could mean low oil circulating and improper lubrication of the hvac compressor. Therefore when there has been a refrigerant leakage big enough the compressor gets to the point where there is not refrigerant to pump and then it pumps out the oil that lubricates the compressor’s internal components. Failure of the a/c compressor will result if the ac system is not recharged, and oil balanced properly.


ac stop leak

What Manufacturers think about the use of a/c Stop Leak ?

Refrigerant must be 99% or more, pure, anything less than this value is considered a contaminated refrigerant and therefore contaminated air conditioning system.Any warranty on the cars ac system will be automatically void if any type of sealer is found in the system.

A/C stop leak.

Vehicle and A/C part manufacturers do not endorse the use of sealants. Sealant is made to plug small holes by hardening when it contacts the moisture in the air. The problem is that a leaking system has absorbed a lot of moisture and spread into every component of the air conditioning. The sealant reacts with moisture inside a condenser or other component, creating a restriction in the normal flow of refrigerant. They will weaken rubber parts, have no effect at all, or create larger particles that will clog the filters, orifices tubes, screen protections and other parts of the AC System.

Flushing the sealant out from the ac system.

Once installed it is difficult, if not impossible to remove all the sealant from the system. There is a big risk of contaminating and damaging a new ac compressor even after the entire system has been flushed. Some air conditioning components like parallel flow condensers or evaporators are virtually impossible to effectively flush.An small and inexpensive service valve core leak could become a time consuming repair job because of the use of a/c stop leak products.

Contaminated refrigerant symptoms.

Some of the symptoms of a contaminated air conditioning system are: reduced cooling performance, evaporator ,thermal expansion valve or orifice tube freeze-up, intermittent cooling, increased compressor noise, higher than normal or lower than normal pressures, and premature compressor failure.

Motor Vehicle AC repairs.

Many shops will refuse to even connect their recovery machine to your cars ac system if they suspect the use of sealant. Sealants could do really expensive damage to recovery equipment creating a huge problem for repair shops.

Air conditioning system leaks

The inside of the windshield has a sticky film.

A sticky film on the inside of the windshield may be caused by a coolant leak in the heater core. Under this condition the coolant level in the radiator should be checked. The heater core should be replaced.

Windshield fogging.

A leaking heater core is also often the cause of windshield fogging problem. Windshield fogging is the result of hot and humid air that condenses on the cooler glass.