Originally Posted by
serpens
I have had functioning room controls, but more often, they seem to do nothing. This contradicts nothing that zephyr17 said, but emphasizes the "not" part of the description.
The temp. dial only controls the baseboard heating, which IME definitely works unless the heat for your entire zone of the car isn't working. If you want cooler air, you need to open the ceiling vent lever (which, again, should work unless the A/C is kaput).