My car loses power when the air conditioning is on

My car runs good when i dont have the a/c on when its on the car dont have power to move i need to put allot of gas so he react to go

My car has 6542 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
A vehicle as new as yours should not be having issues. Any time you run the A/C, the car will be reduced in horse power because the A/C runs off of a belt that powers the compressor. If the compressor is failing or was faulty to begin with, this would cause excess load on the engine. Your particular make and model has, in recent years, had a history of failed A/C compressors.

I recommend having a certified mechanic, such as one from YourMechanic, come to your location to determine if the A/C compressors is failing and needs to be replaced. I would also be aware of any guarantees that your warranty offers you in this regard.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Your car has just under 150 horse power, the a/c compressor puts load on the engine when it is switched on. A lot of cars disable the compressor momentarily on hard acceleration so as to reduce the power loss and let you get horsepower when you need it.
Airflow sensor: When your airflow sensor is failing or dirty, it can send wrong signals to your engine`s computer that can result in power losses while accelerating. This type of issue usually causes your Check Engine” light to come on and your vehicle to behave sluggishly even when there is power.
The reason for this issue is that your air conditioning system is directly tied to your motor—so as you cool off you`re effectively applying some of your horsepower when you set your climate controls to cold air. However, in most cases, this is only 5-6 horsepower.
As some portion of the engine power is diverted towards running of the AC compressor, effective power for the driving of wheels reduce. Also, the same reason why fuel economy goes down while using AC. The engine is partially consuming fuel to power the AC compressor and not the wheels.
Engines lacking in torque lose power and acceleration when the AC compressor is running. This is particularly noticeable in older vehicles which used higher drag compressors for some reason. Newer vehicles use variable displacement compressors for less drag as well.
An engine that is hesitating to accelerate is most likely dealing with a fuel/air mixture that is too lean. Engine`s that are running inefficiently will begin to show signs like hesitation which will only become worse over time.
The most common cause of engine sputtering are issues with the fuel system. These can range from bad fuel filters, fuel pump issues, or fuel injector issues. The other possible source of the problem would be due to poor ignition – think spark plugs or ignition coil problems.
Yes, using the AC in a car can reduce its power and fuel efficiency. The AC compressor is driven by the engine through a belt, and when the AC is turned on, it places an additional load on the engine, causing it to work harder and use more fuel.
Yes — like many of your car`s features, the air conditioning system does consume fuel. Car dair conditioning works by drawing energy from the alternator, which is powered by the engine.
Typically this occurs due to a bad vacuum check valve under the hood. During hard acceleration the AC door system loses vacuum, causing the doors to default to the windshield. This check valve keeps this from occurring. It is located under the passenger side of the hood.
Yes, using the AC in a car can reduce its power and fuel efficiency. The AC compressor is driven by the engine through a belt, and when the AC is turned on, it places an additional load on the engine, causing it to work harder and use more fuel.
The air conditioner functions as a miniature engine, putting undue strain on the engine. When you switch on the air conditioner, the car engine activates components like the idle speed or the air control motor. By compensating with an extra drag, you may raise the idle compressor.
Yes — like many of your car`s features, the air conditioning system does consume fuel. Car dair conditioning works by drawing energy from the alternator, which is powered by the engine.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Air conditioning is blowing hot air – car stalls when A/C is on
ANSWER : In order to diagnose all the different problems you have, I having the A/C pressures checked to see if the system is low on refrigerant from a leaking compressor or another component. The rough idle may be due to a dirty throttle body and idle control system. If you would like to have this checked for you, a certified professional from YourMechanic can come to your car’s location to inspect the A/C and rough idle in order to proceed with the proper repairs.

Car loses power while driving 2001 Ford Focus
ANSWER : Hi there:

This issue is commonly caused by three different systems, ignition system, fuel system and the emissions system components including O2 sensors and the EGR Valve. The best way to know for certain and before you spend any money on repairs, you should have a mobile mechanic complete a car is stalling inspection. This will allow them to pinpoint the source of your Focus’ problems and recommend the right repairs.

My car loses power when the air conditioning is on – 2015 Ford Focus
ANSWER : A vehicle as new as yours should not be having issues. Any time you run the A/C, the car will be reduced in horse power because the A/C runs off of a belt that powers the compressor. If the compressor is failing or was faulty to begin with, this would cause excess load on the engine. Your particular make and model has, in recent years, had a history of failed A/C compressors.

I recommend having a certified mechanic, such as one from YourMechanic, come to your location to determine if the A/C compressors is failing and needs to be replaced. I would also be aware of any guarantees that your warranty offers you in this regard.

Air conditioning smells bad when car enables autostop feature
ANSWER : Your vehicle is new enough that I couldn’t find much information on the air conditioning system. I’m guessing your vehicle probably has a dual scroll AC compressor in which one scroll is driven off the engine and the other is electric. In order to prevent lack of cooling at idle, this design is used in hybrids and vehicle with start/stop ability. So, the lack of cooling may be due to a problem with this system. The foul smell by be result of bacteria accumulating on the AC components. Replacing the cabin filter may help with this problem somewhat. I suggest you have a trained professional diagnose your vehicle firsthand to determine the exact cause of the smell.

My car is losing all engine power off and on when driving
ANSWER : Hey there. With a problem like this, it is a great idea to start with the fuel system. The fuel pump and filter should be checked. These need to be replaced together anyway. Depending on how many miles are on the vehicle, if it has over 100,000-150,000 miles, that fuel pump is going to be tired. It would better your fuel mileage and help other components to have it replaced and is probably a good idea to do this in the first place.

Something like this can also be throttle-related. The throttle should have been inspected when they had it in the shop, but you may want to have it looked over again. If the throttle reads, there is nothing being pumped into the engine and the engine will die. The idle control should keep it running, but with severe wiring damage that may have been effected as well. The only way to figure it out, without trial and error, is to have the car stall when a technician is present with a scan tool and the ability to test several things.

Will a missing air box resonator stop my car from going over 10mph?
ANSWER : Hi There,
The air box resonator missing should not impact the running condition of your vehicle at all. If the air box had cracks in it, this may have caused excess air to be injected into the intake system which may affect the reading of something called the mass air flow sensor which meters the air intake into the engine. When this is producing faulty readings or detects abnormal air intake, this may cause the jerking reactions you describe. The mass air flow sensor monitors air intake as it is mixed with fuel prior to being injected into the motor. This sensor relays vital information to the ECM which uses this to make adjustments to fuel supply to the motor. A dirty or faulty sensor can cause an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions. This type of inconsistent fuel supply to the motor may cause a hesitation, loss of power, a jerking reaction, potentially a bit of black exhaust smoke and typically a strong smell of fuel when this sensor is malfunctioning. I would suggest having a professional from Your Mechanic come to your home to diagnose and inspect your vehicle.

Hot air mixed with cold blows from air conditioning
ANSWER : Hey there. You will most likely have to have a mechanic bypass the heater coolant lines to have this resolved. Your A/C may not be controlling the air flow inside the evaporator correctly out of the vents and may be the blend door actuator stuck in the heat position. Have the AC system diagnosed first before bypassing the heater.

ford focus mk2 2.0 car idle rough and have no power.change.put feet on brake padel-car goes limp mode. 2005 Ford Focus
ANSWER : Hello – check first for problem codes, whether the Check Engine light is illuminated or not. The change in rough running behavior when you press the brake pedal may indicate a failed brake booster. A ruptured diaphragm in the booster would make the engine idle rough, and possibly cause other "drive-ability" issues like poor power. I would recommend a rough running inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.