My air just turned off on it’s own today.

What could be wrong and any idea how much to fix something like that?

My car has 125600 miles.

Experienced mechanics share their insights in answering this question :
On a vehicle that is 15 years old you may have a leak in the condenser, compressor, or evaporator. One of these faulty components may be leaking down the pressure. It’s also possible that one of the pressure switches has just stopped working. I can only recommend having a certified mechanic, like one from YourMechan, diagnose the A/C system to see what caused the issue.

How to Identify and Fix Common car Problems ?

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

Dirty Air Filter: An old and clogged air filter limits the amount of air entering and leaving your air conditioner. When this happens, your AC`s evaporator coils can freeze, and short cycling can occur. If your house AC keeps shutting off, try cleaning your air filter or replacing it with a new one.
Your unit could be low on refrigerant.

This transformation cycle helps absorb heat and lower the temperature of the air. If your air conditioner is low on refrigerant, this means there is a leak. Low refrigerant messes with the pressure control in your compressor and causes the machine to continuously reset.

If the compressor is turning on and off fairly quickly then that means that there is still a pressure issue. It can be caused by low refrigerant or high pressure. It can also be caused by a bad A/C pressure switch. Any of these will cause this to occur.
AC Problems That Cause Your Unit to Shut Off

Unit is overheating: This often means there is simply a buildup of grime inside the compressor unit, but it could also mean there`s a refrigerant leak or another problem.

If your A/C flip-flops from hot to cold and back again, your expansion valve could be failing. The expansion valve removes pressure from liquid refrigerant to allow expansion from a liquid to a vapor state in the evaporator. If the valve is blocked, the refrigerant flow could be restricted or could be too unrestricted.
What would cause an AC to short cycle? Clogged filters, low refrigerant charge, frozen evaporator coils, or an oversized air conditioner unit could cause air conditioner short cycling.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

everytime I turn my car on the ac starts to blow air even if I switch it off. it won’t blow cold air or heat.
ANSWER : Hi there. Based on your question and input, it looks like your AC control switches are damaged, causing the vents to activate even if the switch is not activated. This is sometimes an electrical problem, as it could be triggered by a damaged electrical relay. You might want to have a professional mechanic complete an AC is not working inspection, so they can determine what is causing this issue you’re experiencing and recommend the right repair.

Air conditioning blowing mildly cold air on the coldest setting, turned off/on again, now blowing cold air, should it be checked?
ANSWER : If you are getting ready for a long trip and suspect the cooling fan may be not coming on for the radiator and a/c then you should have the a/c and cooling system performanced checked before trip. Nothing worse than breaking down when out of town in a strange area.

Engine turned off but inside of car still on, now engine won’t turn back on.
ANSWER : Hi there. The symptoms you’re describing with your boyfriend’s 2002 Grand Cherokee appear to be related to a broken or worn out ignition switch or relay. The ignition switch on the inside of the steering column is attached to multiple electronic connections that send signals to a relay box; which in turn, sends the signal to the individual components. The issue could be related to the ignition switch, the relay, or any of the components in between. If you want to have the fault pinpointed in person, I would have this starting issue inspected by a trained professional to ensure that the correct repair is made.

Car won’t turn over. No lights come on when I turn it. Can’t even lock my doorsvor push the seat up or back.
ANSWER : Your probably correct, it sounds as though your battery is done. But it also sounds like you have charging system issues. I’m not sure that fixing your battery and charging system will solve the problem with the car shutting off, but it’s possible that it will and it’s a darned good place to start. By contacting Your Mechanic, you can have a technician come to your home or office to check out your car and help you figure out what to do next.

Cold mist/smoke like air comes out of the air vents when cold air is on.
ANSWER : If you are using regular outside air a/c instead of recirculated air you may be getting a large amount of outside air humidity and can cause a mist to come out of the a/c vents. You should make sure the a/c evaporator drain is cleared and drains freely or the water in the a/c cannot drain fast enough and the blower will pick up the water and blow it out the vents.

Car was overheating almost to the red. I turned heater on, first it blew cold air then warm air for just a minute, then cold air.
ANSWER : Hi There,
The heater not working may be related to the overheating problem you are also having due to a faulty heater blower motor or potentially a bad heater core. As you may know, the heater core is a small radiator like unit that circulates the hot coolant from the engine through the heater core which then uses this warm coolant to heat the inside of the car with the help of the blower motor that blows the warm air through the vents inside the car. When the cooling system is not properly circulating coolant through the motor, this results in the warm coolant not being pumped through the heater core properly in order to warm the inside of the vehicle. In some cases there may be air pockets in the heater core which can cause the heating of the inside of the vehicle to fluctuate between warm and cool air erratically.

Engine overheating can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know the coolant fan switch helps to maintain the proper coolant temperature by turning on and off at specific temperature thresholds. When this switch is not working properly, this can cause the fans to come on intermittently, all the time or sometimes not at all. When this happens you will notice a temperature spike and drop occasionally as the fan comes on and off. When your thermostat is not working properly or is stuck closed, this will not allow the coolant to properly circulate through the engine, which may cause the engine temperature to fluctuate erratically or in some cases just remain hot. As mentioned above, this also restricts the warm coolant from flowing through the heater core which uses this to blow warm air into the cab of the vehicle. I would suggest having an expert from Your Mechanic come to your home to diagnose your cooling system.

When the car is stopped and in gear, the engine often shakes and nearly stalls when the air conditioner is turned on
ANSWER : Hey there. There is an A/C idle-up VSV (vacuum switching valve) on your vehicle. The purpose of that valve is to increase engine speed at idle to accommodate the added load of the A/C compressor when the A/C switches on.

If the idle-up valve is not functioning, it is possible that this is a cause, or part cause, of the issue you are facing. In addition, of course, you could have engine tuning issues which are contributing to the rough operation and that should be evaluated as well during a tune up.

If the plugs haven’t been replaced for 100,000 miles (and perhaps less depending on age) they will have to come out and YourMechanic has the expertise to get them out safely without damage.
To have this scoped out further, I recommend having a certified professional, like one from YourMechanic, diagnose the shaking symptom so that it can be properly resolved.

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.