I have a 98 mazda 626 with 120,000. When the car is running and moving the air works great (doesn't get cold as fast as I like but I can live with that). BUT when I stop and the car is still running the car slowly starts to blow out warm air. What could it be? We tryed putting some of that gas that you can buy from autozone but we dont think that worked. HELP, it's a HOT SUMMER

 

Make sure the condenser cooling fan is running whenever the A/C compressor is. If you are not getting good airflow thru the condenser then high side pressures will get way too high and cooling ability will be diminished considerably. When driving you are getting cooling benefit of ram air.