I'm having problems with my A/C only blowing cold air out of my left passenger vent. No air comes through the rest of the vents when I'm parked but hot air off the engine comes through when I'm driving. Any possible solutions? It's summer year-round here, I really need this fixed!

 

I got this last week try It Sounds like you've got an actuator motor bad on the passenger side(that's not ALL it could be,but it's a common problem on C5's)

JUST in case it's not bad,you might try reindexing the actuators.
Turn the key to "on" position,but don't start the car
Make sure the A/C is off.

Hit reset to clear any warnings on DIC (Door ajar,etc.)

Hold the "Options" button down while pressing the "Fuel" button four times within 10 seconds.

This will bring up the "Diagnostics" text on the DIC

Hit "options" again,and the DIC will display "Manual Diagnostics"

Keep pressing "reset" till you come to "99HVAC"

Press and hold the reset button(even if there's no codes) till it beeps .

You'll hear the actuator motors under the dash running for 20 seconds or so(they're not very loud,so listen closely)

Give it another 10 seconds or so after they stop,then turn the key off.

Now start the car and try the A/C -if reindexing is going to help,the A/C should work right,or at least alot better
(I'm not sure is the DCC units ever work totally "right")

If not,it's time to dig deeper.

Good Luck with it,and Welcome to the Forum!
it

 

well it sort of worked, now the right side passenger vent is working better but both driver's side vents are a no go....arrrrh!

 

tryed it twice it didn't work but i thought lets try something diffrent so I followed all the steps till the motors started indexing half way through the indexing I turned the key to the off position and started the car turned on the A/C and WHA LA both sides blew cold air I didn't have to dig any deeper. THanks for the initial info that got me were i need to be. stay cool