The Squeal means its time to replace the Brake pads.
If you get in the yellow area , this usually means that "alert stop adding refrigerant" just depending on what kit or product you have. There is a website that offers help full information about your vehicles ac system www.idqusa.com.
Change the belt
A freezer may stop freezing due to a malfunction in the compressor, a leak in the refrigerant system, a buildup of frost, or a faulty thermostat.
high pitched squeal from left front wheel does not stop when I apply the brakes. It will stop when I turn the steering wheel even a little bit but returns when I straighten out again
I have put refrigerant in my 2002 Sonata. May sure you get the gauge that tells you how much refrigerant is already in you A/C because if you overfill it, the A/C compressor will stop working. Then you will have to have the system bled to remove the excess refrigerant and that stuff is toxic and will burn your skin and put a bigger hole in the ozone layer. Better to underfill then overfill. The system is pressurized and will not work when there is too much pressure in it.
if you haven't replaced the pad please do. If it persisits, apply anti-squeal paste. Should it persist further, reline the rotors.
Quite a number of problems can cause your AC to fail, but perhaps the most common is low refrigerant. Refrigerant usually leaks, or more accuately seeps, out of the AC system. Over time, you'll need to add more refrigerant. The system detects low levels of refrigerant and shuts off the compressor until you add more.That is NOT the only reason AC systems "stop working".Faulty compressor, clutch, relay, switch, fuse... all of these and more can fail, causing the AC to stop working.
You can try but the squeal will probably come back. Brake squeal is usually due to cracked, glazed, contaminated or inferior brake linings.
If the bearing has gone bad, it can sound like a high pitch squeal --similar to squeaky breaks. If it is the bearing, the squeal will stop as soon as you turn the car off. If it continues, then the sound your hearing is the high pressure escaping from your overheated cooling system which sounds very similar.
Do you have a death wish as that can could possibly BLOW UP IN YOUR HAND. If it is in the red then there is to much refrigerant in the system. If the refrigerant you were trying to install has stop leak in it then your possibilities of a repair shop fixing it are slim.
A pungent odor during a sealed system recovery could be a sign of refrigerant contamination or a leak in the system. It is important to stop the recovery process immediately, ventilate the area, and investigate the source of the odor to ensure safety and prevent further damage to the system. It may be necessary to repair the leak or address any contamination before continuing with the recovery process.