'96 Sub.: front a/c not cool, rear is cold. A/C button light not on.

[Toneski]

The front a/c is only moderately cold when driving and not cold when idling. The a/c button light is currently not illuminated but occasionally does light up. The front a/c seems colder when the light is illuminated. The rear a/c is cold and working fine. What does this all mean? Any help would be appreciated. Also, is this model Suburban known for not blowing strong and cold in the front? I have a Toyota Camry that blows colder, stronger and quieter than the Suburban ever has. Thanks again.
Tony

[radioshack]

ive been helping everyone with the same problem , go to the dealer with you vin # and tell them you need the a/c front control unit .its priced at $100-120 dollars . your next symptom is ac only to the feet .