Heating Control System

[Twilight_Sorcerer]

I have a 93 Lumina, heating control system has gone odd for lack of a better term. When I try to change the location of where the heating system is going it only will run to the floor and window, when I try to change speeds it will only run at high, no other settings work. I have checked fuses and connections and all seems to be in order. Anyone who can give feedback would be appreciated as I love this car. 3.4 Euro model. Btw, other question if anyone can answer it. The brakes on mine are funny as I have heard from a few others that this is normal for this car. Has anyone upgraded to some other types of Pad and Rotors and does it solve the problem. Generally when I am braking it yo can feel the resistance pulsing as the brakes are running.

Thanx

Brian

[cadgear]

As far as it not getting the right location/distribution, that's a vacuum problem. First place I'd check is under the hood, there's a line going to a check valve and then to the vac storage ball in the fender. Check it because the lines are simple plastic that will rot and degrade over time.

For the fan speed, it sounds like your resistor pack is shot. Test the resistance on the coils and see if that is in spec.

[jeffcoslacker]

If you have the 4 whl disc brakes, the rears are probably seized and the front are doing all the stopping, which overheats them and causes rotor warpage, which is the pulsing you feel.

If you do anything check both ends for problems, otherwise if you fix the front it'll be doing it again in a week, and you'll have wasted your money. The rears need to be redone with better than OEM caliper hardware and adequate high-temp silicon based lube on the slides to prevent future problems. Syl-glide is my favorite.

If you look under the back, I'll bet the rear rotors are totally rust on at least one face, having not done anything for some time due to frozen calipers. That's pretty standard with your car.

Agree with the vacuum leak for your selector problem, and the resistor theory sounds right as well. Only high speed uses full system voltage, the others are fractional, so when the resistors go, you only get high speed.