Took my 1994 cadillac in because of a noise problem. It was coming from a belt and I said I think there is a problem with the air conditioning unit, putting pressure on the belt. They replaced several thing (for about $1,000), then took it in again and another $1,500 (total of $2,500) and the problem still wasn't solved. They then said major oil leak and would cost me over $3,500 (total now would be $6,000), and I said it was from the spray I sprayed on the belt while it was running. They said they would check it again, but they didn't. I think took it to the cadillac dealer, and it was the air conditioning part causing problems with the belt. They also said not an oil leak at all. They fixed it and haven't had a problem since. They had no idea what they were doing, and it always took longer than they said to fix - and they never did fix it. Not very compitent workers there.