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The A/C evaporator is the part that makes your air cold. The evaporator is located on the firewall, next to the heater core. As the compressed refrigerant enters the evaporator, there will be either an orifice tube or an expansion valve, which controls the flow of refrigerant into the evaporator. That orifice tube/expansion valve creates an immediate high side restriction, allowing only a small amount of pressure to enter the evaporator. Since the pressure drops, so does the temperature of the refrigerant. The refrigerant exits the evaporator as a low pressure, which then returns to the compressor again to be compressed. The blower motor blows air over the evaporator, which creates a cooling affect. The cooling affect is actually the heat being pulled out of the air. Evaporators should not be flushed, as their design makes it extremely difficult to remove the flush.