Updated at: 18-03-2022 - By: micdot

Your air conditioner is on if your car starts to shut off on its own. If that’s the case, then read on. Even if your air conditioner is on, there are a variety of reasons why your car might shut off, and understanding all of them will help you respond appropriately.n If your air conditioner is on, why does your car shut off? And what can you do to prevent this from happening again? This is a common issue, as evidenced by the large number of motorists who have already encountered it. In other words, if your engine shuts off if you turn the air conditioner on, this means that the load on your engine is extremely high, and the power produced by your engine is extremely low.

Your car’s air conditioner uses a lot of power. To compensate for the lack of power, the engine will have to work overtime. Because of this, your car will shut down if you turn on the air conditioner. If your AC is on, and your car won’t start, read on to learn why this is happening and what you can do about it. Start the conversation now, please.

Why Does My Car Shut Off When I Turn My Ac On?

Many car owners are aware that their AC is causing their vehicle to shut down. This is a widespread issue, as evidenced by the large number of motorists who have already encountered it. In other words, if your engine shuts down if the AC is turned on, it signifies that the load on your engine is extremely high, and the power supplied by your engine is extremely low. The reason for this is that your air conditioner uses a lot of energy. The engine will make up for the lack of power because it takes so much energy. If you turn on the AC, here are some possible causes for your vehicle to stall.

1. A Broken Idle Air Control Valve

If your engine dies after you turn on your air conditioning, this is the most likely cause. When the car is loaded, the idle air control valve raises and lowers the engine’s revolutions per minute (RPM). This means that if carbon accumulates on the idle control valve, the system will not function properly. Because of this, the RPM of the engine will rise and fall before finally stopping. Because of this, the idle air control valve (IAC) needs to be inspected and cleaned. Dip a clean and soft cloth in a solvent and then wipe the surface.

2. A Bad Electronic Controlled Throttle Body

When you turn the key in the ignition, the engine often dies because of the throttle body, which is controlled electronically. The idle air control valve is no longer present in modern automobiles. Instead, a drive-by-wire throttle body is used, which is also known as an electronic throttle body. Electronic throttle control (ETC) will be implemented in the same manner as manual throttle control by using this device to receive the ECM signal. The passageway for more air to enter will be restricted if the carbon builds up. In order to keep the electronic throttle clean, you can do a regular tune-up.

3. A Seized Compressor

This is an expensive explanation. About five to ten horsepower will be used by the compressor to squeeze the refrigerant under high pressure. To lower the RPM, there isn’t enough power in the battery pack. Because of a jammed bearing, the compressor can become stalled from time to time. Attempting to rotate the belt will require a significant amount of effort, which will result in surges of power, and the car will shut down. There’s nothing else you can do.

4. A Stuck Compressor Pulley

The compressor can be in good working order at times, but the pulley bearing can become stuck at other times. As a result, the pulley bearing will be unable to rotate the compressor because it will be dragged against the belt by the belt. The engine will be put under a great deal of stress as a result of this.

5. Worn Belt

The compressor will be rotated by the drive belt. The RPM will drop if the compressor is activated. The RMP will fluctuate if you have a worn belt and the compressor is running. The RPM surges and pauses will be referred to as the car’s surges and pauses. Thus, the engine will be shut off.

6. Overfilled With AC Refrigerant

Your air conditioner’s refrigerant can’t have an excessively high or low pressure. It’s important that the quantity is correct. Your engine will experience some overheating if your AC system is overfilled with refrigerant. As a result, the vehicle will stutter if the AC is activated.

7. An Electrical Problem

An electrical fault could possibly be the blame. When your AC is on, your car may shut off for a variety of reasons. If your car surges, electrical issues are to blame. You need to check your fuse box to make sure there are no blown fuses. A rusted relay must also be checked.

Can A Bad AC Compressor Cause A Car To Stall?

The engine’s power is needed to run the air conditioning system. If you have an AC, you can bet that it will put some strain on the engine. Overload or malfunction may result if this is not regulated. The idle air control valve (IAC), for example, regulates the engine’s idling speed. Idle air sensor control motor is another name for this component. In a fuel-injected IC car, the valve controls the volume of air bypassing the throttle plate as well as the idling speed.

So a problem with the IAC, such as a buildup, will cause the engine to run poorly or stall. The engine may be unable to handle the demands generated by the various systems if this component is malfunctioning.

What Are The Symptoms Of A Bad AC Compressor?

These are the signs that your air conditioner’s compressor is failing.

1. Lack of Hot Air that is Released Outside

If the compressor is working properly, it will draw in hot air from the inside of the house and then disburse it to the outside. It is possible to identify if your AC compressor has a problem by placing your hand close to its fan and feeling whether or not the air is warm or cool. This could be an indication that something is wrong with your compressor. This could possibly be a sign that your gas isn’t being properly compressed by the device. This could indicate a refrigerant leak.

2. Loud or Strange Noises From the Unit

Having a well-maintained compressor ensures a smooth start-up of your system. The compressor’s fan and compressor will be audible. So, if the device makes a rattling, popping, or banging noise, it could indicate that there are difficulties. This could indicate that the CA compressor is experiencing electrical issues.

3. Failure of the Compressor to Turn On

The condensing unit of your home should be checked if your AC is no longer cooling the space. Then, you’ll need to either replace or fix it.

How To Fix That Your Car Shuts Off When AC Is Turned On?

Your engine has to work harder to keep up with the demands of your air conditioner. Electricity will be required. Insist on a thorough inspection of your vehicle’s parts by a professional mechanic. As previously stated, there are numerous reasons why you’re experiencing this issue. The first step is to figure out what the problem is. This is something you can check on your own. However, if you like, you can seek the advice of a professional.


As a result, your car’s AC consumes a lot of power. Why does my AC turn off when my engine is on? is a common complaint among automobile owners. This could be due to a variety of factors. In order to remedy something, you must first identify what’s causing it.