Ac dont blow cold air, freon on green color

Before you replace the most expensive part,how about following a diagnostic procedure. Read this post
AC blows warm air how to diagnose and fix Ricks Free Auto Repair Advice

Cornelius, vent problem could be a pinched or loose vacuum line on controller,faulty AC vacuum motor, faulty AC programmer,etc. needs to be checked out by a good Tech, diagnosed and estimate on repair.
As far as vehicle only blowing cool air, issue could be blend door issue, plugged AC condenser core dirt/debris, low AC refrigerant, plugged AC lines internal, failing compressor, etc., again should be checked out, diagnosed and estimate for repair by a good Tech.
Check the attached links,instruction and guides, Good luck
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1998 Buick Lesabre No Air From Dash Vents
http://repairpal.com/ac-vent-problem-346
Car AC Not Blowing Cold Enough Car Repair Information From MasterTechMark
My Car Is Not Cold What Could be Wrong Elite Auto Repair

Try this link
http://partsblog.olathetoyota.com/1511/common-ac-problems/

this could be a hole in an AC line trace or have the lines traced replace and replaced Freon

Could be low on freon, a faulty expansion valve on the rear system, or other issues. Can you tell if the rear ac lines are hot and cold ?

sounds like you have a leak concern if they are adding freon

however, it also sounds like a restriction in the system and/or a defective TXV

do you have pressure gauges... this is the only way to diagnose an a/c system without just throwing parts at the concern

maybe out of freon,,,check ac to see if it is turning are large lines near firewall cold? if so,u got a temp door not opening if not add freon

replaced clutch, driver ac belts on 2000 montero sport a/c is still not blowing cold any ideas

Needs to be recharged.

you are going to have to put tracer dye in the system and check for leaks
if no leaks then might be low on freon and or there is a resistance in one of the lines