AC Issue

[Rocket]

2001 EXPO full freon charge, blows semi cool for a few minute but not super cold. All the lines are working, rear line is cold to touch in back drivers side compartment where the line is but it runs warm also. I suspect the blend door but don't feel confident pulling out the center console because I am not sure once I get in there how to trouble shoot the blender motor. Aany idea what it would cost to get my mechanic to do this and if it is that how much I am looking at?

 

[KWT2000]

its actually refrigerant R134-A ... freon is a name brand. any ways is the compressor cycling like normal? or is it constantly running? check that because both blend doors going out is uncommon. if the system is over charged you will get this same condition