A/C only blows cold in rear, front blows abient temp. on 1994 GMC Suburban 1500

I have recharged the A/C system, however the front still will not blow cold air. Any thoughts?

1 answer 1 comment
TRy the relay switches( there are 4) located behind glove box. The rear has its own switches, that is why it is not affected.
Thanks for the help I switched them around and it is now working!