the 2008 wrx Hvac knobs are a pain. there seems to be only a little white light in the bottom of each knob. the red glow comes from the red plastic around the base. I was contemplating separating the plastic ring from the knob and using a blue plastic paint. not sure that would work at all. if any one has any suggestions I am certainly open to them. I should have taken pictures of the set up while I had it all apart.