It shouldn't change anything. The climate system is fairly independent of the radiator and the thermostat. The 'hot/cold' knob is connected to a butterfly-type of valve that 'chooses' whether more air comes from the environment or through the engine heating core.
I would have them look at this, and I would inform them that the knob operation changed after repair. I would be surprised if a fix was expensive or required new parts. Hope all goes well.
Friday, April 4th, 2008 AT 6:46 PM