My air conditioning won't work

You might want to check your blower. Your AC/Compressor is responsible for the temperature of your AC. But your blower motor is what could possibly be bad and causing your AC to not push as much air.

Could it be my fresh air filter ?

If you change it over to heat and turn the fan to HIGH does it still squeal? If so, it's the blower motor.

Blower motors should not squeal for any reason. Changed the blower motor. What year is the car and is it an automatic A/C system or a manual system? In other words, can you control fan speed or is it controlled by a computer?

It endend up being my hose that drains the condensation , it was plugged up with dirty and the water was unable to drain so the water was stuck in the hose , so we just unplugged it and it stopped all problems