I took my vehicle in for an annual inspection and was told that the driver's side mirror needed to have the glass replaced because it was clouding over. Since it was just the glass (GM part 88981032 which is about $45), and it was explained to me they can easily "just pop it in", I said to go ahead with the repair before asking for an estimate as it would most likely be inexpensive.. When I received the bill, the cost was over $400 for the mirror. I contacted GM and they explained to me that $400+ would be what an ENTIRE mirror assembly would cost, not just the glass which would be, as said, around $45. But, when I checked the mirror assembly, I noticed I still had the original part and just new glass (I know this because of the presence of small scratches that have been on the mirror housing). That was my first issue with Klick Lewis service. A couple of months later, I had to take the vehicle back for service as it started squealing. They diagnosed the issue and stated it was the tensioner pulley and serpentine belt. Both items were replaced, but the car still squeals just as bad as it had before. This is not my main concern, although it's not ideal. What made this visit worse was this: while I was at the service department, I mentioned that my HVAC control unit was failing (flashing which is a very common issue) and would eventually need replaced. I asked them to quote me a price, which they happily did. All good so far, but when I got home and looked over my bill for the belt and pulley replacement, I noticed they charged me $112 to "diagnose the A/C system" - which is NOT something I had even asked for. So, needless to say, this hasn't left me wanting to ever go back to Klick Lewis for any purchases or vehicle service.