The ac compressor went out on my compass and made an awful noise til it was repaired. My husband found the part through a salvage yard and paid a mechanic to install and charge it. It worked amazing for 6 days then stopped. The air blows just not cold. We took it back to the mechanic who had the car for four days and said the only problem is my car's computer. I'm debating on getting a second opinion. What issues can the cars computer create with the ac and how do I fix it?