Question about 1992 GMC Sierra

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We have a 1992 GMC 3500 Dually, 4X4, Auto, gas V-8. We've replaced the heater control and that did even flicker. So maybe our problem is in the dash plug. I'm in need of finding a diagram for this creature so that we can again use our truck. This is the only thing holding us up from using this truck as it's now winter in Alaska (my location) and it's not wise to drive without a defrost blowing against the windsheild. Can anyone help???

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I am sorry but we do not have wiring diagrams here at fixya. They are copy protected. You can however buy access to the factory manuals here for a small fee.

Posted on Nov 09, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 3 Answers

SOURCE: need a diagram or instructions on how to replace a heater core 97

buy a haynes repair manual for your vehicle

Posted on Mar 12, 2009

Molson02536
  • 3854 Answers

SOURCE: stereo wiring for my 1997 jimmy

Car Radio Constant 12v+ Wire: Orange
Car Radio Switched 12v+ Wire: Ignition Switch (The radio harness does not provide a switched power source. Run a wire from the Ignition Switch.)
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: Pink
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Front Speakers Size: N/A
Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Rear Speakers Size: N/A
Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

Good luck and hope this helps.

Posted on May 13, 2009

alicantecoli
  • 22095 Answers

SOURCE: a/c and heater only blow air out of defrost

either a vacumn pipe is broken or the ends split so its not passing a vacumn to open the flaps,where they are and how to get to them i cant help because i have never worked on one as they are not here in spain.check the engine end first though .Look for some small rubber pipes running from the inlet manifold

Posted on May 30, 2009

  • 6 Answers

SOURCE: 2000 gmc sierra 1500 5.3 v8. a/c heater control problem

your heat/cool and vent selection options are controlled by engine vacuum through small clear tubes attached to the rear of your climate control interface. Other vehicles have small steel pull wires that operate the desired changes. You might try removing the trim and any fasteners affiliated with the interface/console. GENTLY pull outward and look to see if any of these tubes are pulled off or cut/damaged. Did anyone recently install a new stereo in the vehicle? If so, the vacuum tubing and or pull wires that change your outlets could have been damaged when the stereo unit was pushed into place. Hope this helps

Posted on Sep 09, 2009

Testimonial: "Very good information. THANKS!"

  • 1509 Answers

SOURCE: 2004 gmc 1500 sierra heater control stuck on

Defrost is the default position. Is the control a autyomatic temperture control unit? ( you set the temp and select automatic) if it is the system is completely electronic. You push the buttons and the control still says defrost or can you select something else and the control shows it but it just keeps coming out the defrost? If the control changes and the air comes out the defrost anyway and the cheack engine light isn't on, then the problem can be blown fuses or an air door actoater not working. Does the dash emit a clicking sound? if it does with the covers off the bottom of the dash reach around touching the different pieces till you touch the idem that is clicking. this is an acutor motor, or blend door motor. they have gears in them that wear out and break the motors aren't repairable and you just replace the ofending motor. the door that is moves can be stuck. and may have to be freed up with blaster, WD40, or other rust buster till it moves easy. maybe after getting the door to move smoothly you can get the old motor to move the door wiithout having to install a new one.

Posted on Jan 06, 2010

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