My a/c is working but it is not as cool as a/c systems of other cars. Even when I turn it on @ level 4, it's not that cool.
I bought this car 3 years ago and never checked anything about A/C.
Now I have 178,000 miles.
What should I check first if I want to have "cold" air.
I checked coolant today; it's enough - i can see the liquid(green coolant) is filled up to 'max line' on the plastic tank.

Thank you for reading my post.

 

Is this a manual or Automatic Temperature Control (ATC)? For manual, there is a mechanical push/pull wire that controls the heater core control valve. Occasionally, these will get out of adjustment and heater core valve will not fully close leading to higher AC vent temps.

More likely the AC system has leaked enough charge to reduce cooling capacity.

Unless you want to DIY, you will need to get professional help to measure system high/low side pressures and adjust charge level. DIY will require AC manifold gauge set, charging equipment, and modest knowledge of AC systems to charge correctly. It is not an exact science, but can be done.

If you want to DiY let us know and we'll try to help.

good luck