Air Conditioner Coil on 1992 GMC Yukon

I have been told that there is a coil that needs to be cleaned in order for the air conditioner to blow cold air. Any idea where it is located and how I get to it?

Asked by for the 1992 GMC Yukon
could be the condenser or could be the evap. condenser is in front of the radiator and the evap is inside the dash.

Roy