Do shops still sabotage cars for profit?

They're not cheap, but they are a lot of work and i don't think the payoff is worth the amount of work that has to go into it. Ford trucks for instance; you have to remove the entire dash along with the steering column. It's like they built the entire truck around the heater core.

Most dishonest people aren't too bright.

That's what I was thinking of, too. Loose a mechanic or your bay for a day on changing out a heater core in a Taurus when in the same amount of time you could have a day of brakes lined up, honestly, making better money and quicker to boot.