I'm not sure if I ever mentioned having trouble with our car's AC before... it started summer of 2012 and the issue was literally on and off. The AC would run fine one day and then suddenly stop working and it would eventually start blasting out HOT air - it got so hot at one point that I even had to stop on the roadside because I was getting dizzy enough to worry about passing out. It didn't help that the outside temps were at 102 degrees F.
We keep bringing it back to the dealership and to our local repair shop and they couldn't find it. The only suggestion we got from both was to load up the AC with freon mixed with a special dye. When it stops working again, we can bring the car in and they can look for traces of the dye and hopefully, find out where the leak is occurring.
By this time, it was already fall and we weren't dependent on the AC anymore so I asked hubby to push this off until next spring.
By Spring 2013, we brought the car back to the shop and had it loaded with freon and the special dye. While it was being tested, the technician happened to hit a wire and the AC stopped working again - that was the culprit! They tried wiggling the wires and found one that was loose and corroded, this was replaced and the AC worked fine after that.
Some months later, the AC started wigging out again. *sigh* Hubby decided to play with the relays one time and found that if he wiggled or pulled out and reinstalled the AC relay, it would jumpstart the AC and get it working. Last week, he dropped by the dealer to buy a replacement relay, it cost us $7.35.
It's been several days and the AC still works. Hubby's theory is that the loose / corroded wiring affected and damaged this relay. I hope this is the end of our AC woes (well, it should be... at least for 2013 as outside temps are currently in the high 60s so we really don't need AC anymore). It is not a good time to be spending more money.