Question about 1995-1997 Chevy 1500 Truck Ignition Starter Alarm Switch

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1993 GMC Suburban K1500 Air Condition Fan and vent choice problem


Two problems:

1) ac/htr fan operation is intermittant, works great when it works but the switch doesn't always turn it up, down, or on. I think its a relay fault but I cannot find the relay. Where is it.

2) tick, tick, tick, tick noise from under glove box area when I start up, shut down, or alter the ac vent choice controls. How do I fix this?

My blower motor fan will shut off and on by itself, without even touching it. When I am on a bumpy road, it will usually turn itself back on. I had the same problem on my Ford Crown Vic. It turned out to be the blower motor speed controller. But my Chev silverado has a resistor pack. Dont know if that is the problem or not.

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I would check the large wire that attaches to the blower motor under the right side of you're dash. The connector plug sometimes burns and melts. make sure it is tight.

Posted on Jan 11, 2011

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Faulty relay, there may be three of them, had the same problem on a 91 GMC truck

Posted on Feb 02, 2009

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This is common gm prob with your vehicle. the control unit needs to be replaced. and as for the resistor pack im not sure where you are looking, but in the dash in the same area as the heater controls is a gray or silver box and this is for the radio.

Posted on Jan 12, 2009

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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

Aug 05, 2008 | 1993 GMC Suburban

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