Question about 1993 GMC Suburban

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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?

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  • Shayne7s Dec 16, 2008

    I have the same exact problem with the tick

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  • 169 Answers

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

Posted on Aug 22, 2008

  • Chris DeVictor Jul 22, 2012

    #2 - I have the same problem with my 93 GMC suburban. But defrost mode doesnt make ticking noise return. However the sound returned on a/c high max?

  • SCOTT OCONNOR Jul 23, 2012

    The actuator for the "re-circulation" door is most likely malfunctioning, To be absolutely sure of this you need a scanner that can access the climate controls in your truck. Given the information you gave us, I am sure it is the problem. You can purchase the new actuator from a GM dealer and they can print you out a diagram of its location. there are 3, 7/32" screws holding it to the heater box and 1 plug. you could first disconnect the plug and see if the noise stops before you make the purchase also. Good luck Chris!

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