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4 wheel drive wont engage on a 1990 GMC k 2500 sierra,if actuator where is it located if not what else could be the problem

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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


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

Dec 05, 2016 | GMC Cars & Trucks

1 Answer

1990 GMC suburban actuator and fuse location. There is not one on front differential and no place for fuse in fuse block. 4 wheel will not engage. No owners manual


The actuator will not be on the front differential or drive line, it will be on the transfer case, which is mounted behind the transmission. Follow the front drive shaft back from the front differential, and the component at the rear of the driveshaft is the transfer case. That is where four wheel drive is engaged/disengaged.
I'm not familiar with your vehicle, but if you have a separate lever to engage 4wd, there will not be a fuse for the actuator - it is a manual system. If the 4wd is selected electrically, check that all wiring and connectors on the transfer case are in good condition.

Sep 25, 2016 | 1990 GMC Suburban

1 Answer

I have a 1994 gmc k1500 4x4 wont go in four wheel change acuator on the front diff transfor case engage but axle dont


That truck did not use a vacuum actuator, it used an electric motor motor. If your transfer case is engaging and you can see the front drive line spinning, then you either have a bad actuator, switch, or the wiring is bad. I would recommend unplugging your actuator and checking for power at the wire while someone puts the truck in four wheel drive. If there is power going to it, then replace your actuator. if not, follow your wiring back and check all components. They also sell an aftermarket cable actuator for those trucks which are much more reliable.

Jan 28, 2015 | 1994 GMC Sierra

1 Answer

My 1993 GMC sierra 4x4 kepps blowing fuses when I try to engage it


Unplug the front axle actuator. Replace the fuse. Put in four wheel drive. Did the fuse blow? If not replace the front axle actuator.

Nov 16, 2014 | 1993 GMC Sierra

1 Answer

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

2000 Gmc sierra sle 1500 on the floor 4x4, 4x4 engages but nothing to the front wheels, the drive shaft spins, but still nothing, any suggestions?


Sounds like you need a front axle actuator. This actuator bolts to the side of the front differential housing. It is electrically engaged. You can purchase them online starting at about $40

Jun 03, 2012 | 2000 GMC Sierra

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

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

3 Answers

4 wheel drive will not engage on my 1989 gmc sierra 2500?


actually that first soultion is wrong it is correct on smaller pickups but on the full size pick ups they use a differnet sytem
there a electric actuator on front axle
there be two elctrical plugs on front axle u want the bigger of the two other one is just to turn the 4 wheel drive light on
un plug actuator then remove actuator after it removed plug it back in but leave it out of axle turn key on and shift down to 4 wheel drive the actuator should move out if it dont that your problem if i does move this isnt your problem it either the tranfer case or in front axle

Jan 07, 2010 | 1989 GMC Sierra

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