Question about 1992 Chevrolet K1500

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1990 Chevy 1500 4x4 won't engage 4 wheel drive

I just replaced the front axel actuator and harnes to convert from vacume to electric. After shifting the transfer case lever to 4H or 4L it takes a very long time before the 4 wheel drive engages. Sometimes 2 minutes, sometimes an hour. The actuator is brand new from GM and the harness, cost of $300.00 WHAT AM I MISSING????!?!?!?! Please help..... Charlie

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The 4x4 do not engage in my1990 chevy pick up what i need to check

Posted on Jan 20, 2010

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Goodfellow,Me To The Brown wire That Is alone is Constant Hot (10) Amp,Now Mine Works fine,Dont Forget The sencer On Top Of transfer Case, Unhook It You Will Know If It Is Bad,I Had two Problems no Help,Now i know, harlemsunny@aol.com

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It may not be gettin a good ground to the new actuator,try running a new wire from the ground side of the actuator to the negitive side of the battery

Posted on Jan 26, 2009

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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

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I have a 1996 Chevy Blazer and my 4 wheel drive will not lock in. Another problem I am having is when I try to change my settings for the heater direction, it will not work. Can both of these problems be...


First. The 4wd front axel is engaged and disengaged by the vacum actuater, located under the hood on the
rt. side, either on the fender or under the battery box.
The actuator controls a cable to the front axel, that locks and unlocks the 4wd. As for the heat. There is
a vacum actuator for the heat/defrost, under the dash.
As to how the 2 problems are related. If they share the same vacum source on the manifold, and it's
broken or blocked. Or a vacum leak big enough to
drop the vacum pressure to the point where they can't
do the jobs properly. Hope this helps.

Feb 12, 2010 | 1996 Chevrolet Blazer

1 Answer

Not kicking into 4 wheel drive


Check to see if the front drive shaft is turning. If it is and the wheels are
not moving. Check the vacum actuator, located under the battery pan.
Make sure there are no leaks or kinks in the lines, do the same at the vacum solenoid valve. If these check out. Check the clutch cable from
the actuator to the front axel. Make sure it's not broken or kinked, as
the cable engages and disengages the front axel. But if the front drive
shaft is turning. And it's an electric shift control check the fuse first.
If it is transfer case related I will need to know whether it's manual or electric shift. You can get back to us with that info if neccesery.
Or if you find a problem with any of the parts I have mentioned.
Hope this helps. Good luck.

Feb 06, 2010 | 1999 GMC Jimmy

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Hello I drive a 2004 chevy blazer and when i switch to four high the light goes on, but doesn't kick into four high. Please help just got 19 inches of snow.


If the light fashes then stops without shifting I suspect the shift encoder motor. 4 low will only shift in nuetral

Feb 06, 2010 | 2004 Chevrolet Blazer

3 Answers

Our Chevy S-10 ZR2 won't go into 4 wheel drive


under battery is a vacum operated actuator that pulls your 4 wheel drive in to front axle.Make sure it has vacum going to it .Sometimes the actuator will get a hole in the rubber housing and 4 wheel will not engage.You could also check your vacum lines going to a canister on drivers side fender as sometimes the will come un-pluged and your actuator under battery will get novacum to it.If not it could be your actuator motor which is on the transfer case and is electric controlled and expencive300-400 dollars.Also could be a vacum line

Jan 09, 2010 | 2001 Chevrolet S-10

1 Answer

1992 chevy k2500 4 wheel drive not engaging. was driving in 4 high with no problems. shut truck off and no 4wd. no lights and no 4wd. new rear end, new transmission.


I have a 19934x4 bought it with 4 wheel drive notworking. indicator lights for 4x4 would notlight up but transfer seemed to be shiftin ok. frontaxel woul ot ingauge. I repled the front axel actuator an works fine now no problem. actuator is on the passenger sid back of the front axel pigand has a plug, mine was 2 wireroundpin plug but some have a flat pin 4 wire plug. 70 dollars at NAPA. wasa realy simple replacement didnt even need to jack up the truck. the actuator h a pin that electronically puses out engauging te front axel. a easy test is to put the truck in 4 wheel high. holdthe brak and givei little gas ad havesomeoneelse stand to the side ofthe front of the truck and see if the front axel spins. ifso th actutor is te most likely prblem. hope this helps.

Dec 11, 2009 | 1993 Chevrolet K2500

2 Answers

Front drive, 4 Wheel drive won't engage


that vacume line goes back to the transfer case, the end that goes behind the motor hooks to a steel tube so it does not get hot from the exhaust., my guess it should be hooked up so it will feed vacume to the vacume ball so it can lock in the axels. if you start the car and shift into 4 wheel drive and listen under hood you should hear a hissing sound, that is vacume, if you can't hear it there, you may have to craw under the right side to hear it, probably came unhooked underneith the car

Feb 01, 2009 | 1995 GMC Jimmy

3 Answers

4 wheel drive won't work


There is a vacum powered actuator on the front differential housing on the passenger side. It gets it's vacum from two valves mounted on the firewall just behind the battery(to left). The white line feeds manifold vacum to the valves. Check for vacum at white line with engine running. If no vacum there is a break in line from manifold. If vacum check the pink and blue lines by applying vacum to each one. The vacum should hold. If not check lines from valves to vacum actuator. Most likely it will be the actuator. If both lines hold vacum check valves. Remove electrical connectors from both valves. Connect a wire from one of the terminals of the valve to ground. Touch a wire from the battery + to the other terminal of the valve. Listen for a clicking sound. If no sound valve is bad. Replace valves(s). If this doesn't lead you to the trouble it's probably a mechanical problem inside the differential. However most likely there would other noises.

Dec 20, 2008 | 1992 Jeep Wrangler

2 Answers

4 WHEEL DRIVE


Try to replace the vacume lines to the actuator on the front axle?

Oct 14, 2008 | 1995 Jeep Wrangler

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