No, I do trust my mechanic. I've been dealing with my current mechanic at least as long as you have with yours, and the double-double whammy is most unusual. Part of the reason I trust my mechanic is that if something doesn't stay fixed, I can take it back and they'll fix it without further charge without question.

The reason the steering didn't stay fixed was that my guy got a defective part from his supplier. I haven't gone back about the A/C fan, in part because I got a very late start this morning and didn't want to come home early to retrieve the car afterward.