Buick Enclave Air Conditioner Not Working

So A Month Or So Ago My Air Conditioning On My Driver Side Stopped Working. It Was Only Blowing Hot Air While The Passenger Side Would Blow...

A/c Light Blinks 3 Times. Outside Temp Currently 88 Degrees. Tried Putting It In Auto Climate Control And Also Front Vent Manual, None Of...

I Took It To A Mechanic, And He Said That Just The Blend Door Actuators Are Broken, And He Can Turn Them By Hand. But He Said I Couldn’t...