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4wheel drive wont engage on 1990 GMC sierra k 2500 could it be the acutator or something else if so where is it located

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  • GMC Master
  • 7,515 Answers

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
Best Manuals

Posted on Dec 05, 2016

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Posted on Jan 02, 2017

  • 375 Answers

SOURCE: 2007 gmc sierra 2500 IAT sensor

Well, the IAT (Intake Air Temperature) sensor is located on the air intake duct between the filter and the throttle body (Assuming you have the 6L motor). The wires are easily visible at the plug that connects the sensor to the wiring harness. That's the easiest place to access them.

Posted on May 18, 2008

  • 507 Answers

SOURCE: 1990 GMC Sierra 4x4 1500

the connections near the front axle that activate the motor to engage the system aren't melted? That's a comon problem for that body style. If there good, sounds like it could be that motor itself. To figure out if it's you motor or transfercase, jack up the rear end, have a friend inside shift into 4 wheel drive, or try to, and put it in gear and apply some gas. If the front driveshaft is turning then it's something with the front end. If not, farther back in the system.

Posted on Sep 22, 2008

  • 124 Answers

SOURCE: where is the 4x4 encoder motor sensor located on my 03 sierra

the encoder motor sensor is inside the encoder motor. the encoder is located at the transfer case. Remove the encoder and by part number 88962315 this is the sensor. you will have to retime the motor after
hope this helps

Posted on May 06, 2009

  • 1 Answer

SOURCE: 2003 gmc sierra duramax 2500

Problem with Diesel Fuel System. Gmc 2002 duramax 2500 HD 4x4 will start 

Posted on May 15, 2009

dennymulford
  • 1055 Answers

SOURCE: 4 wheel drive not working

its a bad actulator,cost 65,00 at auto zone

Posted on Dec 31, 2009

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How to engage gmc 2500 in to 4-wheel drive


4wheel drive wont engage on 1990 GMC sierra 2500 what could the problem be ,if it is acutator where is it located

Apr 15, 2013 | GMC Sierra Cars & Trucks

1 Answer

My 90 GMC Sierra 2500 won't engage the 4 wheel drive.


on the transfer case under the truck, there is a relay. both of my trucks have done the same thing and it was that simple problem. the wiring is on the drivers side of the case.

Jan 14, 2011 | 1990 GMC Sierra

1 Answer

1999 gmc seirra , the four wheel drive is not working properly , the transfer case seems to be engaging but the front wheels are not spinning


There is a gas canister on the front differential that engages the hubs for 4wheel drive. make sure it is functioning properly. It works by way of heating the gas in the canister which forcess a rod to slide and engages the front diferential. During the cold months it takes longer to heat the gas in the cylinder and sometimes won't allow the diff to engage. Check to make sure it is functioning it is located on the inside right hand side of the front differential.

Jan 07, 2011 | 1999 GMC Sierra

1 Answer

Front wheels won't engage when in 4 wheel


Then the problem would be in the differential. something came loose or broke off the actuator on the inside

Jun 17, 2010 | 1996 GMC Sierra

1 Answer

1996 GMC Sierra with button actuated 4 wheel drive. When pushing button to "4 High" The light flashes then goes out and does not go into 4wheel drive. What could be the problem and were should I start...


I believe the 4 wheel drive is engaged by a vacuum actuator on this model. Look under the hood for a rubber "banjo-like" diaphragm that has a cable coming out of the middle of it. If I'm right, you'll find a tear in that rubber diaphragm. Post back if this doesn't work and I'll dig deeper. Check that first though.

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Gmc Sierra Tailgate wont shut


Check with a Body Shop Technician for the proper description.

Jun 15, 2009 | 2004 GMC Sierra 2500

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All of a sudden wont go forward or rev .


Hello, The first thing to check is the transmission fluid level. When you check the fluid does it have a burnt smell? If so, you probably have an internal failure. Have you had the transmission serviced? Your trans filter may be stopped up.
I hope this helps.
CYA, Gator241

Jan 30, 2009 | 2000 GMC New Sierra 1500

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