I have a 2003 Pontiac Grand Prix with manual HVAC dual climate control. A couple months ago, I noticed that speed 1 & 2 went out on my heat/AC blower control. a few weeks later, speed 3 went out and recently speed 4 went out, leaving me only with speed 5. Also, when the fan is turned on for speeds 1-4, the automatic headlights don't work, the headlights will only function in manual mode or if the fan is turned off, or on speed 5. I have replaced the resistor with a new updated one and I still have the same problem. I replaced the HVAC control switch and still the problem is there only works on speed 5. any ideas? is there a relay that controls the fan speed 1-4?
