What's even worse is the cost of repairs, then finding out they didn't fix it.
My '97 Chevy Tahoe spent all last fall (sep through early December) at the garage waiting for parts, one of which was the hvac control. It had the common problem of the resister packs in the fan control failing. It was down to only working on high intermittently. Everything else worked.
I have a good neighbor in Wisconsin who picked it up and parked it in my garage, so I didn't have to make the road trip to do it. Memorial weekend was the first chance I had to get it out. I get there and discover:
* 2 flat rear tires. One was just very low and held more air. The other was completely flat and the bead was off the rim. Had to change that one. It needs new ones anyway, but what the heck?
* hvac control doesn't work. Previously, everything worked except the fan speed control. Now the fan speed control works, but nothing else does. This has the classic GM 3 knob control. The temperature knob might work but couldn't tell because it was so hot out. it was blowing hot regardless of the position. The knob that switches between the top, front, and bottom vents does nothing. The A/C (which was working) now doesn't work at all. The button doesn't even illuminate, and when pushed I don't hear the compressor run. It behaves as if it isn't connected at all.
So now during the next trip I will have to spend time fixing it again.