Question about 1993 Chevrolet S-10 Blazer

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I can't get into 4 wheel drive checked actuator , vacuum lines, makes noise but won't make change in transfer case

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Should be two actuators one on front diff and other on transfer case.

Posted on Nov 10, 2010

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Changed to 4wheel drive low and I can't get it to change back to 2 wheel drive.


1999 Blazer. Thing's to check. 4x4 problem. There's an actuator pump under your battery plate. Make sure its in good shape and its working proper. Next check the cable that runs from the pump to the front transfer case. Then check the actuator switch on the front transfer case. Then check the vacuum lines from the front transfer case to the rear transfer case, that should be right under the drivers side door. There's also a actuator switch on the rear transfer case witch two vacuum lines run out of. Check them also, and last check your fluid level in your transfer case. Start from the beginning to the end. Don't forget to use your 4x4 every know and then to keep it up to power. Its not like the good old days. Where a pull of the lever on the floor engaged the 4x4. I hope this helps.

Apr 09, 2014 | 1999 Chevrolet Blazer

1 Answer

I have a 2004 2500 HD My 4 wheel drive suddenly quit working I put in a new actuator My 4 wheel drive indicator light show I'm in 4 high or 4 low you can hear my transfer case shift but it still won't go...


May be the problem is not in the actuator in the case but in the actuator that engages the hub locks . Check for vacuum line / electrical wires faults . The noise may be from the hub lock or from a cv joint in that side.

Mar 09, 2014 | Cars & Trucks

1 Answer

I have a 96 gmc jimmy i have changed the actuator,actuator cable,all the vac lines,vac switch and switch on differential and still the front tires dont engage,the transfer case is locking in and so is the...


on your Jimmy you need to put it in 4 hi and up under the battery tray is the actuator for the front dif. make sure the vac hose going up to it has vacuum. if it doesn't then start tracking the hoses going down to the transfer case. one goes to the actuator, one to the vents on the transfer case and transmission and one goes back up to the vacuum canister, it's located on the hood on the drivers side. if the canister isn't getting vacuum then nothing is going to work. i just had to repair the hoses in the truck i put the trans in. the 4 wheel drive now works in it. i would have never know this, the hoses drop over by the exhaust and get hot and burnt and start cracking and breaking up and leaking. this can also cause some minor running problems. also. one last note. where the hoses attach on the transfer case. that connector has to go on correctly. it has a pin hole in it to line up on. if you put in on wrong things won't work.

Apr 22, 2012 | 1996 GMC Jimmy

1 Answer

What makes the four wheel drive light come on in my 2001 gmc yukon


there is an electric motor driving the actuator on the transfer case.if it sticks the 4 wheel drive will not engage and the light will not come on. tapping on the actuator lightly with a plastic hammer sometimes will get it to work again.some have vacuum lines as well and those lines have to be checked that there is vacuum

Mar 10, 2012 | Cars & Trucks

2 Answers

Front axle does not engage. Push 4hi or 4lo button, transfer case motor engages front drive shaft, front diferential actuator extends, but no 4 wheel drive. What do I check next?


There may be vacuum lines running down to the hubs. If so check them for vacuum when engaging and dis-engaging 4 wheel. If you can't feel any vacuum, trace lines, and check for leaks.

Dec 13, 2010 | 2002 Chevrolet Silverado 1500HD

1 Answer

My 89 chevy s-10 pickup 4 wheel drive doesnt work. the transfer case goes into gear but the front hubs seem like they dont lock in i was told it was a fuse or a vaccuum line but i have never heard of...


On the 1989 s10 it has a vacuum actuator that actually locks the front differential in ,you need to check that first, those go bad real often,and without it. There's no way it will lock in the axle, the transfer case will lock in ,but the front differential uses a actuator. It 's located under the battery tray and there is a cable towards the front of the differential. Id say the actuator cable has gone out, most parts stores can get you one ,that what goes wrong with those 99% of the time and it only takes about 5 minutes to change it out. Good luck but check the vacuum line to the actuator under the battery tray.

Nov 16, 2009 | 1989 Chevrolet S-10 Blazer

5 Answers

4/04 ford f150 4x4 front axle actuator won' t stay disengaged


Even though you checked the vacuum lines and found no leaks it does not mean there isn't a problem. The check valve in the line closest to the firewall actuator is probably your problem. Had the same issue replaced this line and solved it. The check valves in the vacuum lines are your best next guess.

Jun 09, 2009 | 2004 Ford F150

1 Answer

Four wheel drive not engaging


You can check the vacuum lines and diaphram that are located underneath the battery shelf. Comes out really easy. Check that the lines are not broken. There is a vacuum line that runs to a solenoid in the center of the fire wall, make sure they are not broken there, and there is an actuator cable that runs to the transfer case. Sometimes it is as easy as replacing the vacuum hose, the actuator cable, or the diaphram under the battery shelf went bad. If you ever had a battery leak acid because it went bad.....that acid goes under the shelf and eats those lines. Hope this helps.

Sep 09, 2008 | 2001 Chevrolet Blazer

2 Answers

2000 GMC Jimmy Transmission Whine


Does it sound like a loud winding sound coming from the front right side? I have a 2001 Jimmy and the 4wd tries to engage when driving up steep hills and going at highway speeds. The actuator vacuum switch engaged when the transfer case vacuum switch sends the vacuumed air to the actuator. What is happening is their is either a leak in the vacuum lines, a faulty actuator switch, or a faulty transfer case vacuum switch. When the jimmy has enough air pulling in, the extra vacuum is trying to push the actuator switch in when it is not supposed to. It is a much cheaper fix than a transmission. GMC should have recalled the whole 4wd system on any of the S10's, the JImmy's, and Blazers.

Jul 30, 2008 | 2000 GMC Jimmy

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