1999 gmc sonoma, auto, push button 4wd. jacked the rear wheels off the ground and pushed 4wd button, front drive shaft turns, but no power to front wheels, seems like everything is working like it should, except no power to front wheels. HELP Thanks
when i push either button in the front or the rear nothing happens..as if there is no powerwhen i push either button in the front or the rear nothing happens..as if there is no power
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Ive gone thru this THREE TIMES w/ my '99! Theres a thin, rubber vacuum hose that wears thin, gets dirt/oil/water in it & shorts a relay. The last mechanic replaced the hose w/ steel brakeline & Ive had no problems for 2 yrs.
Change the vacuum pump under the battery box an make shour the cable an clip are still goodChange the vacuum pump under the battery box an make shour the cable an clip are still good
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? 7:13
https://www.youtube.com/watch?v=IP0jhBG0jv4
Jun 30, 2012 - Uploaded by Mark Jenkins
How to Diagnose and Repair Chevy Blazer and GMC Jimmy 4WD\ 4x4 Issues .... The transfer case either doesn't want to engage, or it gets stuck in 4 lo. ... my s10 4x4, I watch your videos and I start to work on my truck,I start ...
? 9:02
https://www.youtube.com/watch?v=stooGR4BcjE
Mar 2, 2012 - Uploaded by 1A Auto Parts
I have a 1996 chevy blazer ls...my 4 wheel drive stoppedworking. ... 4l and I hear the click underneath me, but that's it..itdoesn't engage, but the ... I have a 2003 gmc Sonoma and when I put it into 4 high it feels like it does
Did you reverse more than 10 metres? Sounds like the hubs are locked into 4wd.this will work if you have auto hubs.but sometimes you have to turn the hub manually if they don't disengage.if you have gone some time or distance in 4wd
If it has the push button controls on the dash I have had those fail frequently. A lot of times you may push the button and the light may blink and then still stay in 2wd. That switch is also the control module for the 4wd. If it is the know select you need to check for power at the actuator on the transfer case.
if you had the rear wheels still on the ground in 4WD and it never drove the vehicle off the jacks or stands , you have a problem in the transfer case
in other words the transfer case is not selecting WD
If your transfer case has an "auto 4wd" push button choice then the front shaft will turn all the time. This is due to how the transfer case is designed internally to provide that option.
Jack up the rear wheels and put it on jack stands. Have someone get in it and put it in 4wd and drive. Release the brake. Rear wheels are spinning only right. Don't get under it but look under it and see if the front driveshaft is spinning. If the shaft is spinning but the wheels aren't it is likely a bad front axle actuator. If the front shaft isn't spinning it is a transfercase problem.
Watch what clinks? You should see the vacuum servo move the linkage. The servo could have a leak. You can connect your own hose to the servo temporarily, and simply **** on it, then plug it with your tongue. After about 15 seconds, if it holds that vacuum, then no leaks.
The linkage could also be binding. Transfer case could also be binding. Try helping the servo by hand. Careful when under the vehicle. Chock wheels and make sure in neutral while underneath.
try going into reverse for 10 feet then go to drive for 10 feet that might help if not it is to the wiring to you 4x4 engage system (wires to your wheel hub)
when i push either button in the front or the rear nothing happens..as if there is no power
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