Question about 1998 Chevrolet S-10 Pickup

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Why would a 98 chevy s10 zr2 not disengage from 4lo to 2hi?

We changed the vacuum switch. no vacuum put the old vacuum switch back on.had vacuum. actuator doesnt work now.it did before i put new vacuum switch on. you cant hear it working when you hit buttons like before.

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  • 58 Answers

Make sure the vac hose is pluge up to switch in the right place only gos in 1 place

Posted on Jul 04, 2013

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Posted on Jan 02, 2017

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SOURCE: My 98 chevy blazer won't shift into 4wd.

Most common problem is the vacuum diaphragm that is so inconviently mounted UNDER the battery tray.The cable that locks in the front diff is attached to it and vacuum pulls it in/out.

Posted on Dec 23, 2008

  • 6 Answers

SOURCE: s10 pickup 4wheel drive wont shift from 4hi to 2hi

Mine is on the front drivers side, is yours? I just about fell over when I discovered who they designed it!

Posted on Jan 01, 2009

  • 36 Answers

SOURCE: how to change 4 wd motor(actuator) 1997 s10

Before changing the actuator check the vacuum lines at the vacuum switch on the left side of the transer case if they are wet with transmission fluid the the switch is bad and that will prevent 4wd from engaging.

Posted on Jan 15, 2009

  • 366 Answers

SOURCE: selector switch stuck in 4lo

pull 4wd fuse inside fuse panel and atc fuse from underhood fuse center, truck wil go back to 2wd,check control box behind pass.side kick panel ,elect. connector at box,full of corrosion will cause weird 4x4 problems!

Posted on Mar 28, 2009

  • 14 Answers

SOURCE: 99 Blazer-push button 4wd not working

Make sure that all 4 tires have the same tread on them, if one or more of them are different, then the 4wd may not engage. I had the same problem with my blazer, I changed only 2 tires at a time. The front tires would rotate faster than the rear ones, the gears in the transfer case won't line up right.

Posted on Apr 29, 2009

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1 Answer

2000 chevy suburban stuck in 4 lo anyone out that cant help


Put truck in Neutral while key in run position engine off or on (doesn't matter which). If it's pushbutton 4wd then try hitting 4low again. if that doesn't work some of the chevy trucks required you to press 4hi to get into 4high and then press 4hi again to get back to 2hi, unless yours has a 2hi button. In that case press 4hi to get into 4high and then press 2hi to get back to 2wd. either way you need to be in neutral to get out of 4lo. I have shift on the fly (Mechanical Shifter on floorboard for transfer case) on my 1990 Suburban and still have to put it in neutral to get out of 4lo. Good Luck.

Jan 30, 2014 | 2000 Chevrolet Blazer

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My 4wd keeps jumping to 4lo and it should be in 2hi help


if your have not changed one of the differentials it is safe to drive i would check the vacuum lines going to the transmission

Apr 22, 2013 | 1999 Chevrolet Blazer

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HOW DO I PUT A 1998 GMC JIMMY IN 4 WHEEL DRIVE?, DO I HAVE BE IN "PARK" OR CAN I CHANGE IT INTO 4 WHEEL DRIVE WHILE IM DRIVING?


You should be able to put in 4x4 while in drive less than 35mph. Mine had a switch to turn to engage or dis-engage.

Oct 15, 2009 | 1998 GMC Jimmy

1 Answer

Why would all the lights come on my 4 wheel drive buttons about ten minutes after i start the truck


My 2003 Silverado has done this several times. This happens (at least on my truck) when I switch from any other mode to 2H when the truck is not moving. The front hubs are locked in the engaged position (actually, it locks inside the front differential) when in 4HI, 4LO, or Auto-Trac. When switching to 2HI, the front hubs try to unlock. The mechanism may bind, especially if they haven't been used for months, like during the summer, and don't completely move to the unlocked position. A switch tells the controller when unlocked, but doesn't always get triggered when the hubs don't get completely disengaged. Usually cycling between 2HI and Auto-Trac while driving will free up the hubs and make prevent the problem of all 4 lights coming on at once. Turning the engine off and then restarting it will usually correct the problem with all 4 lights lit at the same time by resetting the transfer case controller. Then, you will be able to switch from 2HI to Auto-Trac and back to 2HI while driving, as described above, to free up the mechanism. If this doesn't fix it, you will likely have to replace the switch in the front differential that tells when the hubs are completely disengaged, or, more likely, the motor that disengages the hubs/drive axles in the front diff.

Jul 16, 2009 | 2004 Chevrolet Silverado 2500HD

1 Answer

On my 2000 chevy S10 blazer, when I push the 4HI button, the 4HI and 4LO buttons flash a yellow light and it won't shift to 4WD, stays in 2HI and the light in the 2HI button is on yellow......I hear...


vacuum leak or vacuum locker solenoid problem. a great way to check for both is to remove both vacuum lines from the solenoid (located on firewall above destributor), and put a connector between them, push the button on the dash and see if it locks in.

Jan 18, 2009 | 1999 GMC Jimmy

4 Answers

2001 s10 pickup transfer case wont go out of 4lo


something has broke inside the transfer case keeping it from going into any other gear

Jan 03, 2009 | 1999 Chevrolet S-10 Pickup

2 Answers

S10 pickup 4wheel drive wont shift from 4hi to 2hi


A good ground is very imporant on these vehicles

Dec 31, 2008 | 2000 Chevrolet Blazer

1 Answer

My 98 chevy blazer won't shift into 4wd.


Most common problem is the vacuum diaphragm that is so inconviently mounted UNDER the battery tray.The cable that locks in the front diff is attached to it and vacuum pulls it in/out.

Dec 22, 2008 | 2000 Chevrolet Blazer

2 Answers

4wd stuck in 4Lo


it is either the control switch or the actuator. look if light is flashing on push button switch. if so it is stuck. you can check actuator on front axle, to watch and see if it is moving.

Dec 06, 2008 | 2001 Chevrolet Tahoe

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