Updated at: 20-08-2022 - By: Lucas

During the sweltering summer months, your car’s air conditioning is essential. It helps to keep you calm and relaxed when you’re behind the wheel. How do you handle an AC that’s on the verge of overheating? If you have any questions, please don’t hesitate to contact us.

How Does A Car AC Unit Work?

Car Overheats When Idling With Ac On

Refrigerant flows into your car’s AC system as soon as you switch it on. The gas is then created by compressing the liquid. The condenser then cools the gas down further. To make your car’s interior more comfortable, the cooled gas is routed to the evaporator.

What Are The Symptoms Of An Overheating Car AC Unit?

This summer, your car’s air conditioner is working extra hard to keep you cool. If the AC unit fails, you’ll be in for a long, hot, and uncomfortable voyage.

Trouble starting your AC system or poor driving performance are telltale signals that there is a problem with your AC system. In the event of an overheating AC unit, these can serve as a warning sign:

Puddles of water under your car when parked

If the AC system’s condenser or evaporator drain hoses get damaged, water leaks are likely to occur. Vehicle maintenance concerns should not be prioritised over drain lines or fluid lines that leak.

As a result, a sweltering air conditioner could be the result.

Water dripping from the AC vents

It is possible that condensation has built up inside the system if water is dripping from the air vents of your vehicle. This can occur if the drainage system has a leak or other failure. Your AC system may be clogged with bugs and debris.

Replace an outdated refrigerant to avoid moisture buildup. In the event that your car is exhibiting any of these symptoms, it’s important to rule them out before proceeding any further.

Your Air Conditioning Unit Is Making Strange Noises

If you hear hissing, bubbling, or rattling noises coming from your air conditioner, it’s likely that something is wrong.

If you hear hissing or gurgling, it’s possible that your evaporator coils are unclean, while strange noises indicate a leak. If your air conditioner is producing strange noises, there may be a loose belt or some other problem.

Your Air Conditioning Unit Is Ineffective On Very Hot Days

If your car’s temperature fluctuates or isn’t as cool as it used to be, a refrigerant recharge may be necessary. Air conditioners that have low refrigerant levels are more prone to breakdowns and will cost you a lot more to fix.

Recharging your AC system will no longer suffice, and it may necessitate more extensive repairs. Any time something like this happens, it must be dealt with immediately. If you ignore these warning signs, you run the risk of damaging your air conditioner and having to buy a new one.

Your AC Unit Is Making Unusual Noises

Reduced refrigerant levels or another system problem may be the cause of a noisy air conditioner. If you hear any strange noises coming from your car’s air conditioning equipment, get it checked out as soon as possible.

The Causes of an AC Unit Overheating

Car Overheats When Idling With Ac On-3

You should never attempt to fix an air conditioner yourself because it is a complex system with numerous moving parts. In order to maintain your system functioning smoothly, you can perform numerous small tasks by yourself.

Almost every air conditioner owner has experienced the problem of an overheating machine at some point or another. Overheating of an air conditioner can be caused by any of the following:

Incorrect Refrigerant Level

When the refrigerants in your central air conditioner run low or empty, you will experience problems with the system. Because R410a and R22 (which were once prevalent) were discovered to be harmful to the environment, they are no longer produced. Instead, most units use R410a, which is far more efficient.

Incorrect Thermostat Setting

This is quite crucial. Your air conditioner’s thermostat should be calibrated by a professional if you want it to keep your home at the temperature you choose. Make sure you don’t damage anything inside the machine if you do this yourself.

Dirty Air Filter

Your air conditioner does a good job of cleaning the air before it enters your home, but it also collects dust on its filter and other internal components. By changing this filter on a regular basis, you can prevent dust from accumulating in your system and ensure that no obstructions are obstructing the passage of air or coolant.

Clogs in Ductwork

The speed at which cool air travels through small spaces might cause it to become extremely hot. It is possible for the cool air to overheat while traveling through your ductwork if there are any obstructions in them.

Refrigerant Leak

A refrigerant leak can lead to a slew of issues with a cooling system. Toxic gases or damage to the surrounding environment can occur as a result if the problem goes unaddressed for a lengthy period of time.

Because so few companies are still working on it, the only option is to replace the entire system. With infrared camera repairs, we know exactly what it takes to keep the equipment functioning at its best.

Variations in Voltage

Even if it’s difficult, you can try to solve this one yourself. If your AC unit overheats and shuts down when the voltage dips below a particular level due to bad wiring or storms, you may need to replace it. If you think an electrician might be able to help, do so.

Any of these issues should be addressed as soon as you become aware of them. If you see that your home’s cooling system is beginning to fail, it’s even more critical to have it repaired as soon as possible.

Finally, I’ll say this.

Maintaining a clean and well-maintained air system is essential if you live in an area with a lot of mildew or if you have a lot of pets that shed a lot.

Why Does My Car Overheat While AC Is On And It’s Idling?

Increased engine RPM and overheating can be caused by AC compressor overload. A vehicle’s cooling system is designed in such a way that it doesn’t interfere with the vehicle’s performance.

When the auxiliary belt stops allowing the compressor to turn, problems begin to appear. Because it is unaware of this, the automobile will continue to make an effort to turn the compressor, causing the engine to overheat.

A dirt or ice buildup in the throttle body can also cause airflow to be restricted, resulting in overheating and overloading your A/C system when you switch it on while idling.

Fixing this problem can be as simple as having a professional shop clean out your intake or, if you’re confident, cleaning it yourself. Also possible is the presence of a refrigerant leak that would necessitate the need for repair or recharge.


What Can I Do If My Car Overheats While Idling with AC On?

The coolant level should be checked if the engine overheats while the AC is running. Low coolant or a clogged radiator are the most likely culprits. You may also see if the fan is working properly by doing this check.

There may be a problem with the fan belt or air conditioner. To further reduce wear and tear on the AC system, consider using a water-soluble lubricant. Take your car in for repairs if none of these solutions work.

How Often Should I Refill My Car AC Unit?

You should get your air conditioning system examined for leaks and performance every two years, according to industry standards. Turning on the air conditioner and hearing strange noises like chirping or squeaking indicates that a professional mechanic should inspect the system.


It’s not uncommon for the AC compressor to overheat, and it can happen to any vehicle. It’s critical that you have it checked out by a professional so that they can determine the specific nature of the problem and make any necessary repairs.

Regular maintenance, such as oil changes and tune-ups, will help keep your vehicle’s cooling system running efficiently even while the air conditioning is on and the engine is idling.

Let a mechanic diagnose what’s wrong with your vehicle if you’re experiencing any problems with it (or others). We’d love to hear from you if you have any further questions!