How To Fix An Overcharged AC

By: Editorial Team

Many AC overcharge problems are due to do-it-yourself refiling using air conditioner Freon cans. Over-pressurization of the system results from the pressure gauges, which are either non-existent or faulty. Adding more coolant than necessary results in the overcharge and is frequently done in the spirit of “better safe than sorry.” Poor cooling, no air flowing out of the vents, strange noises coming from the engine bay, and the check engine light coming on are all possible signs of an overcharged AC. Symptoms of an overcharged AC include;

1. Poor Cooling

You probably overloaded the system if the AC operates worse than it did after being replenished. Even at full power, there won’t be enough airflow so the air won’t be chilly enough to match the temperature you’ve selected in the vents.

2. There Is No Airflow

If a few minutes later no air is coming from the vents, turn off the AC right away. In some circumstances, such as when the engine is cold, it’s usual for the AC not to turn on immediately. Don’t risk destroying the system because it is overcharged to the point where anything could fail!

3. Noise

Repairing an AC failure is typically expensive, and if the compressor fails, it could rip the serpentine belt and lead to further issues. One of the tell-tale symptoms that anything is awry is an unusual noise emanating from the engine area after refilling the coolant. Leave the car in park gear and raise the hood to get closer to the compressor if you can’t hear it but are experiencing one of the first two symptoms. It can be located on the serpentine belt, which is distinguished by its shape.

4. Build-Up Of Frost

A car’s AC may become more likely to form ice inside and around its condenser unit if it receives more coolant. The air conditioner might first blow cold air. However, frost can prevent the condenser from effectively converting warm air, causing the warm air to blow out of the vents instead.

5. Complete Shutdown

Overcharging may be indicated by a car air conditioner that won’t start or shuts down unexpectedly. The cooling system was under more stress because of the extra coolant, which caused wear and tear to accumulate over time. The compressors will eventually burn out if users don’t fix this issue.

6. Strained Engine

A typical car engine will last approximately eight years or 150,000 kilometers. Some cars with more modern engines than their older counterparts can travel 200,000 miles or ten years. However, regular overcharging of the AC may shorten their typical lifespans.

Poor fuel economy might arise from adding a lot of coolant to a car’s cooling system. A loss of up to five miles per gallon (MPG) may be incurred by drivers. If the driver continues to drive while the air conditioner is overcharged, engine power may decrease by between 10 and 30 horsepower (hp).


To fix this follow the below steps;

  1. Use a standard car coolant recharge system to bleed an overcharged car air conditioner. Once you have the required tools, take the following actions:
  • While the engine is still running, park the vehicle and expose the engine.
  • Connect the recharge kit with the proper connector but without the coolant bottle.
  • To drain extra refrigerant, turn on the gauge on the recharge kit.
  • Press the lever on the gauge repeatedly to drain more coolant when the arrow has reached the green region.
  • Check to see if the car’s air conditioner is blowing cold air and if the gauge’s indicator remains steady in the green zone.

2. It is important to understand the risks involved when repairing overcharged air conditioning equipment outside. Your air conditioner sometimes overcharging is primarily caused by the Freon in your system. To be sure, a pressure gauge must be connected. If this gauge reads pressure in the 60s or higher, get your AC fixed.

An overcharged AC performs flawlessly while the temperature decreases, but when the temperature rises, the gas inside the AC compressor expands, leading to overfilled conditions. The pressure that builds up while your air conditioner is running can be quickly released using a garden hose. Try to relieve pressure once you’ve secured the hose and closed the vent.

Release the pressure slowly after making sure the connection is secure. When the gas is released, wear sturdy fabric gloves because it is cold and might burn your hands. Wearing goggles will protect your eyes from the sand, which can cause blindness if it gets in your eyes. That is not who I am. Think about implementing the required safety measures. To be clear, this substance—whether you name it Freon or coolant—is exceedingly hazardous to both you and the environment. Of course, you can’t do it unless you’re qualified. It is a sinister operation, and things will get much worse if you are discovered.

3. The other choice is to have a mechanic perform it because they are equipped to manage this potentially dangerous task.

Below Are Other FAQS Regarding AC Functionality.

1. How Can I Tell If My Air Conditioner Is Over- Or Undercharged?

There are two potential causes for the hot air your air conditioner is blasting at you. The ac system has to be charged because it is undercharged or is having problems with overcharging. For confirmation, a low-side pressure gauge would be necessary. When you connect the hose to the outlet, keep all the vents closed. An abrupt shift in pressure could be an indication of a coolant shortage or an issue with the cooling system of the car. It would be better if you had a dual gauge or could buy one. You might be able to get by with a straightforward one-gauge setup, though. To understand what is occurring inside, you must be aware of the outside temperature. Release the wheel, step outside, and keep a watchful eye on the mileage.

Even though your car is currently off, this process of balancing low and high voltages is normal. Please don’t panic. You’ll see that the cursor has stopped after some time has passed. The word for this is static pressure. You may now understand this static pressure somewhat after learning how cold it is outside.

Now, depending on the model, if the outside temperature is in the 90s, the static pressure within the system will be between 103 and 104 PSI. If you see that the indicator is at 130, which indicates that the pressure inside the system is higher than the outside, this may be a sign of overcharging. Alternatively, if your static pressure is just 71 PSI and less than the ambient temperature charge the system.

2. How Can I Prolong The Life Of The Air Conditioning In My Car?

The following are some tips for maintaining a functioning automobile air conditioner:

  • Give your air conditioner at least 10 minutes of work per week.
  • After turning on the defrost, give it five to ten minutes to operate.
  • Just because it’s chilly outdoors doesn’t mean you should stop using your air conditioner.
  • Recharge your car’s air conditioning system every two years.
  • Maintain and upgrade the system.

3. How Soon Does Refrigerant Start Working?

The automobile refrigerant should start working practically immediately after being applied. But for the coolant to settle, it might take from 15 minutes to two hours. If the product seems to take longer than usual to settle, be aware that there may be a leak. If a leak is a problem, use a leak detection kit.

4. Why Does My AC Still Spew Hot Air After Being Recharged?

Lack of coolant is a frequent issue when charging the AC on your own, and is the most likely cause of the AC not blowing cold air.

5. Can An Overcharged AC Freeze?

Yes, an overcharged air conditioner may freeze up, and since the compressor is the most expensive component, that’s where it will most likely happen. Allow a professional to manage AC recharge as necessary to avoid this.

6. The air Is Cool, Yet it Doesn’t Get Cold.

Low refrigerant is typically to blame for this problem. The pressure in the system decreases when there is insufficient refrigerant, which prevents the clutch from releasing and starting the compressor’s cycle. Insufficient refrigerant in the system may also result from:

  • Blocked or malfunctioning Condenser – The condenser is the component that removes heat from the refrigerant to return it to a liquid condition after it has been in a gaseous state. The air that exits the vents won’t be chilly if the condenser is blocked or damaged.
  • Failed Clutch Switch: Without this part, the air compressor won’t be able to work and won’t be able to condense the liquid refrigerant into gas.

Solution: These important parts will need to be tested by a professional for obstructions, damage, or failure, and they may need replacing.

7. My AC Reeks Of Mildew.

When you switch on your air conditioner, a foul mildew odor will fill your nose. It is caused by bacteria growing in the system. It typically occurs in older, less-used, or cars that routinely utilize the highest setting for the air conditioning (due to extra moisture in the unit). On the evaporator, bacteria, mold, fungus, and other microorganisms might grow under the dashboard. A bad smell emanates from the vents as a result of this development.

The solution: Air filters may gather debris, moisture, dust, and other pollutants and, over time, release an odor. You may address this problem by changing your air filter. If changing the filter does not remove the smell, a technician will apply an anti-bacterial solution to the area around the evaporator to remove mold and other pollutants from the system.