SOURCE: 1993 GMC Suburban K1500 Air Condition Fan and vent choice problem
MIKE.
#1) YOU PROBEBLY HAVE A BAD BLOWER MOTOR OR POSS. A BURNT CONNECTION @ THE MOTOR. IF THE FAN WORKS ON ALL SPEEDS EVEN INTERMITTENTLY. THEN THE BLOWER RESISTOR IS OK WICH CONTROLLS THE VOLTAGE TO THE MOTOR TO GET THE DIFFERENT SPEEDS. WHEN THE RESISTOR BURNS OUT THE FAN JUST WON'T WORK ON CERTAIN SPEEDS. THE "RELAY" IS ONLY USED FOR HI-SPEED FAN USE. TRY HITTING THE MOTOR WHEN YOU GET IT NOT TO WORK AND IF IT STARTS THN YOU HAVE A BAD MOTOR.
#2) THE NOISE YOU HEAR WHEN TURNING THE IGN. ON AND OFF IS PROBABLY THE DEFROST DOOR CONTROLL ACTUATOR/MOTOR WICH HAS A POTENTIOMETER IN IT THAT TELLS IT WHEN TO STOP MOVING AS IT REACHES THE CORRECT POSITION. WHEN YOU TURN THE KEY OFF IT BY FEDERAL LAW HAS TO RETURN TO THE DEFROST POSITION IN CASE OF FAILURE. THE LITTLE SPLINES IN THE MOTOR OR ON THE SHAFT CAN GET STRIPPED WHEN THIS HAPPENS. TRY DUPLICATING THE NOISE BY SELECTING THE DEFROST ON AND OFF WITH THE KEY ON.
I WILL CHECK FOR YOUR FEEDBACK LATER
SOURCE: car stalls out
Has anybody been working on the car latley or has it gotten the spark plugs or wires changed latley the clicking that you hear is normally spark plug wires going bad they ark a spark to the closest metal around them 1 way you might be able to see is pop the hood and start the car at night if you see it sparking then thats it just buy a set of wires there prob 40 bucks... I had alittle toyota and thats all it was its because there small 4 cylinder cars so something tiny will make the whole motor act up,, Check that and let me know ill help you out more with any questions please rate me
thanks,
Steve
SOURCE: Vent control
You have a vacuum leak.Defrost is the default postion(no vacuum).
See if you can locate the small black vacuum line that goes inside the vehicle on the passenger side near the heater core. The trace it back,should see it going to a canister then to the intake manifold.Make sure it is not disconnected or broken somewhere.
SOURCE: dome lights won't come on
Check it very careful use a test bulb to verify the fuse connection, sometimes visual checking alone is not enough.
SOURCE: heating / air conditioning control stuck to front defrost vents
There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.
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changed the fuse box under the driver side and fixed all the lighting issues and blower issues but the blower fuse still gets really hot with the blower on.. so i think maybe blower motor going bad or the conector to the fan speed switch might be the problem it is discolored so will eventually get to that
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