A/C problem. - Car has no A/C driver side. Need help deciding problem.

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We have had 2 Chevy Dealers & 1 local repair guy... tell me 3 different things for this A/C problem. Who to believe??? Can hear AC condenser clicking on & off while idling, have blower that blows out at all speeds & on forceful the recirculating button below radio. Have been told 1)recycling switch problem, 2) when had a brake line rupture - braided line had been rubbing on something & rubbed a hole in brake line leading to zero brakes one day! We had asked the repair guy to look at the A/C issue also & were told that the A/C line had been compromised by the brake line as well - small pin hole leak now in ac line, 3rd) driver side actuator problem. All quoted about $500++ to fix it. I went online and found a video on the actuators. I pulled drivers & pass. side(s) dash trim apart lightly. (Removed the plastic colored trim coverings for the dash area.) I can see the actuator on pass. side working. I can see one of the actuators high up above the gas pedal... it has the little circular dime size ring move when I turn the knob that changes the flow of the air from feet only to feet & chest, to chest only, and to defrost. I believe then this the mode actuator. Down below this about 6" & right next to the black vent line that runs across the bottom of the whole driver area - I see another actuator where the little ring thing that is supposed to move.... but doesn't move whether a)I move the air flow (Mode?, or b)whether I move the driver side toggle button that changes the temp. from colder to hotter. I have the diagrams from GM on the locations of the three actuators on this side, but can't find another one. I'm thinking the 3rd actuator is the defrost actuator and it must be way up inside and behind the mode actuator. Knowing we've had 3 different people look at this AC issue, and knowing what I've I told you.. what do you think? Do you think it's a driver side temp. actuator that needs to be replaced? Please advise!