if the a/c came with the truck. it should stay working under federal law.Yes, and then a driver files a complaint with the steward about not having A/C in the truck.
And the companies solution is to take everyones A/C belt off so nobody has it - can't be a issue if everyone is dealing with it equally.
You also have legal protection against being forced into a unsafe tractor as-is. If you deadline a tractor and they still make you take it (If its truly a safety problem not something like A/C ect.) make sure to get it in writing. We've had one unit thats been in and out of the shop since we got it for steering issues, nothing major but if you weren't paying attention on a bump you might **** yourself, took a few years but after nearly rebuilding the entire thing they got it figured out.