How to evaluate car AC system, evacuating hot air and bringing in a cool breeze is one of the best parts about owning a car. The AC system helps make driving more comfortable, but it’s important to keep it in good working order so that your car can perform at its best. Below are some tips for evaluating your AC system:

Start the car, turn on the AC and vent the air from the AC vents.

Start the car, turn on the AC and vent the air from the AC vents. Check that the compressor is running by watching for a steady increase in engine RPMs as it turns on. If there’s no change in engine speed or sound after you turn on your AC, then something major could be wrong with your vehicle’s cooling system, and this may mean costly repairs are needed.

Does the air come out cold?

Does the air come out cold?
Let’s be real: this is a question you probably don’t want to ask your mechanic. But if you’re paying for a tune-up, it’s worth knowing if your car’s AC system is working properly. If it’s not, coolant could be low, or there may be a problem with the thermostat. Either of these issues would make it difficult to get any kind of cold air through your vents and into your car, so check those first before paying for anything else (unless they’re cheap fixes).

Is there any obstruction in my vents that might block airflow? You may have seen pictures on Reddit or social media where people have kept their car windows open during winter months when their heaters aren’t functioning properly—and while this can certainly help keep things from freezing over inside of your vehicle, it also means that snow and ice can build up around the edges of each vent shroud and block airflow completely! To prevent this from happening again next year (or right now), make sure all obstructions are removed from around each vent before turning on the engine again and checking its operation later down below when we cover troubleshooting steps further down below in our guide!

Is it colder on some vents than others?

If the air is colder on one side of the car than it is on another, this could be the result of a duct leak. To check for this problem, use your hand to feel along any and all vents. If there is a difference in temperature between two adjacent vents, then you may have an issue with your ductwork.

If all of your vents are equally cold or warm and there’s no noticeable difference in temperature from vent to vent, then it’s more likely that either your evaporator or condenser has failed (or both). To determine which component might be at fault here, turn off your AC system and let it sit for about 30 minutes before trying again. This will allow any remaining moisture in each part to dissipate so that you can accurately gauge how well each part is working.
Read More: https://autoremedy365.com/how-to-evaluate-car-ac-system/

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Start the car, turn on the AC and vent the air from the AC vents.

Start the car, turn on the AC and vent the air from the AC vents. Check that the compressor is running by watching for a steady increase in engine RPMs as it turns on. If there’s no change in engine speed or sound after you turn on your AC, then something major could be wrong with your vehicle’s cooling system, and this may mean costly repairs are needed.

I don't really know much about cars, just have basic knowledge about basic things. One thing I know is you don't just start a car and immediately turn on your A/C especially from a cold start, which you failed to mention. All other points are duly noted.

If one vent is colder than the other- Gas is low.