A/C problems..rear ac works.. front doesnt

Hi.. first time to post.. anyway.. im in Louisiana so of course we already have to start using our air cond. anyway.. my front air does not blow cold on my 98 yukon.. but the rear blows cold.. the compressor is running... well.. we know its workin cuz the rear air is stayin cold.. any suggestions??

Hi, I am not quite sure about this, but you may have a stuck flap door directing the air flow.
Or a control that lost control.
Take care, Eggert :bananasmi