The air conditioner is not as cold anymore anyone else experienced this problem?

 

AC is a closed dydtem. the only time you will experience the problem that you have is due to a leak somewhere.

You can use Dytel (leak detector) introduced to the system thru the low side port. It will shiow where the leak is. Mst common is a hose connection. Look for any dirt buildup on connections,as the dirt will stick to the refrigerant oil also leaving with the refrigerant.

Or you can get a can of leak stop at Auto Zone or such, but that is just a bandaid. Will not fix the underlying problem.