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Sounds more like a bad fuse panel. Or burnt wires somewhere. The body control module has some control over the lights, but not the A/C blower. I replaced many GM fuse panels that cause strange things to happen. Like your problem.
probably just the light itself has burned out the light should be cheap under 10.00 but there are might be a few panels you have to take off to get to it, and will probably break a few plastic hangers as well but those are pretty cheap as well. I do recommend buying a decent interior panel pliers. they make things so much easier.
The head control in the dash is most likely the problem,the control in the dash,will have to be replaced.,only thing you can try would be to disconnect the negative battery cable for 10 seconds and put it back on,then turn the ignition on,then start,see if the controller starts to work again,if not replace the head.
more than likley its the heater motor its self but befor you change anything remove the trim around the radio and heater then remove the screws from the bracket that holds the heater controll in place then gently pull it out of the hole there and remove the plug on the back it will be the one on the right if looking at the controll knobs, then using a test light turn heater on and touch each contact to see if you get power there if so then more than likley the heater controll if fine and the heater motor is bad this happen alot more than you think those controlls rarley go bad usualy its the motor and to get to this, you remove the underside of the dash on the passenger side and you should see the heater motor next to the door area just in the corner under the glove compartment, it is possable you may have to remove the glove compartment incert as well mine has 3 screws holding it in 10mm heads with a philips "+" slot in the center of each screw head it sounds worse than it is its not hard at all to change but again befor removing unplug the connecter there and using the test light with the heater on test each lead to see if power is coming through if it is then motor is bad if not that doesnt mean the controller is it could be the blower relay its located next to the blower if it goes bad then the heater blower wont come on either except high providing the resister has a pass through it it doesnt it will not come on at all
WELL YOUR 12 VOLTS TO THE PARK LIGHTS ON EXTERIOR OF CAR COME FROM THE HEADLIGHT SWITCH.. ALSO THAT VOLTAGE FEEDS THE INSTRUMENT CLUSTER... KEEP IN MIND THAT THE DASH DIMMER MIGHT ALSO BE BAD... WHEN YOU TURN ON PARK LIGHTS YOU SHOULD SEE THE DASH LIGHT FUSE GO HOT IF NOT SUSPECT THE HEAD LIGHT SWITCH
HI, not to long age i replaced my heater core in my 1991 Chevy S-10. Its not as hard as you mite think it would be, but its no a walk in the park.. :) There are a few things you need to remove. First the glove box door, ash tray, the panel that surrounds the stereo and stereo, also the tray that holds the ash tray and last inside the glove box there is a small plastic panel at the back remove that and that should do it if I remember right. Ok now the fun part, be prepared to get your hands a little bite beat up, you are going to need a lot of extension for your wratches, some antifreeze and lots of pattions also about three hours. Injoy Blake.
I've done it many times myself. Here is what I do:
Remove the trim that covers instrument cluster, radio, heater control unit. To do this, you must remove 2 screws from trim that are mounted at top of instrument cluster area. Next remove screws above cigarette lighter/head light switch. Now that should be all of them. Position your steering wheel all the way down. Pull off of the trim from the radio area. It is snap fitted so just give it a little tug. The part of the trim covering the instrument cluster is really tight. You have to be careful and pry the thing out while trying not to scratch the top of your steering column. It does come out eventually. Now remove heater/ac control unit. Should be a couple of screws holding it in. There are vacuum hoses and a heater control cable mounted to the back of it also, but you shouldn't have to pull the thing all of the way out. Just turn the light socket to remove it from the back of the heater/ac unit and R/R the bulb.