My A/C is blowing warm air. Someone said to clean the A/C fliter where is it? It's a 97 GMC Sonoma 2.6 L. Two wheel drive.

It needs refrigerant or freon ,most car has a pressure sensor switch to activate the ac solonoid magnet to run the compressor and cool the inside cabin of the car.manually check if it low on freon,by opening the pressure side line cap and suction side by pressing the valve make sure you wear gaggle eye protection see if freon will come out a lot with pressure ,if only air come out in there there is no freon or refrigerant.

It does not have one, and if it did it would not make it blow warm air, just less air. Have the freon charge checked in the AC system for proper pressures, would be a good place to start, & check to see if the AC compressor is kicking in. I hope this helps.