Chances are that ther is air in the system. The fact that you had to add gas (refrigerent) means that there is a leak (which lets air in the system.
You need to locate the leak and repair it. Then evacuate the system and recharge it.
Meanwhile check the operation of the blend doors under the dash to be sure that they switch from floor to vent to defrost when the switch is set in those positions.
Sunday, December 16th, 2012 AT 3:16 PM