There is a leak somewhere! If they serviced it and added a/c system uv dye then take it back to see if they can find the leak or faulty a/c part.
AC System probably needs refrigerant added.
I believe there isn't one, just the surge tank cap. All the fluids are added from there.
See the link I added.
Freon may need to be added when the ac is not blowing cold enough. A Freon gauge can tell you for sure if the pressure is low.
There probably is a leak. Is there still freon in it? There are ares in the a/c system that are not visable. Was Dye added?
You need to find the leak and fix it. Can be a hose clamp, can be a seal on the servo pump.
bad condenser
There is no heater matrix for the back air vents, only and evaporator for the A/C. My suburban always blowed cold until I added an extra rear heater matrix.
There is no dipstick. The fluid must be checked and added in at the bottom of the car.
== == When was the last time that the car had a professional tune up? More than 6 months ago? Throwing things/money at the the problem is silly, get it diagnosed by a pro and then have it repaired and adjusted properly.
mine did the same thing i just added some coolant to it and it fixed it and havent had any more problems watch your hands though its the line running between the fan and the motor ... i walked around with burnt hands for a week
1.253x1.25 =6.253+1.25=6.25 this is the correct answer i checked it