Summer is here and temperature is rising. I've searched the forums on how to fix my AC. My problem was the compressor was not turning on. I've read that if you have low freon (r134a), the compressor would not start. however, it seems as if most people have it start when the car starts but turn off when it realises it has low gas, or consititly switch on and off indicating low gas. So my problem was it didn't switch on at all, not during startup or anything. It seems the power cable leading to the compressor is not on properly. the connector looked like it was on but was very loose. So, if you were diagnosed with a bad compressor or heater valve, or something like that, check this connecting first. It could save you thousands. Really! Some places asked $2000 just to replace the AC Compressor. Post back with comments if this little Fix helped you out.