18 silverado 5.3l
Blowing hot air. Took to mechanic and cc recharged and dye added. 1.2lbs put in by shop. Drove home 5 minutes. Truck sat for 24hrs. Went to drive it the next day and ac not working. Lasted less than 48hrs. Back to shop and they checked it and it was completely empty. No signs of UV dye anywhere. They are stumped. It works great when they fill it but must have a major leak, but without any visual leaks where do I go next? They said they used a sniffer and couldnt find anything. I assume the only place left for it to be leaking is the evap behind the dash. Is there any way to see inside and identify a leak without pulling the whole dash apart?