Question about 1996 Chevrolet Blazer
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Posted on Jan 02, 2017
SOURCE: four wheel drive wont engage
If you have push button 4-Wheel Drive, it is recommended that you use it every once in a while, in order to keep gunk, rust, and corrosion to build up on moving parts. The mostly likeley (though not definite) reason would be that you let the 4-wheel drive unused for so long that corrosion has built up on the parts and the actuator that engages the 4-Wheel Drive doesn't have the power to engage it past the corrosion.
You'll need to take it in to be cleaned, or to have parts replaced. In the future, every month or so, engage 4-Wheel Drive and drive around in some mud, grass, sand, or any other loose ground for a bit, just to keep the parts moving and clean.
The service Four wheel drive light is to alert the operator the system is not being read properly by the ECU.
If the ECU loses contact with or position of the Transfer case actuator motor the service light will come on. Same thing goes for the front diff actuator.
So it may be a bad switch, sensor, or an actual problem in the 4WD linkage. This is not a Oil Change light that you can ignore a few extra weeks - it indicates a problem that should be taken care of ASAP to avoid costlier problems down the road.
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Posted on Feb 21, 2009
SOURCE: 4x4 wont engage
There is a switch that has twwo wires going to it, it's located just above the motor on your transfer case,on the drivers side, one plug goes to the motor and the other goes to this switch, it's the motor that shifts it into low and high range, I'm not sure what the switch is called but it tells the front end when to lock and unlock.
Hope it helps
Posted on Mar 05, 2009
SOURCE: four wheel drive wont engage
I fought with this problem every year since I had the Sportage. And it was so frustrating to find out just when you really needed it, that you did not have 4-wheel drive. I replaced the hubs with manual hubs and I wish I would have done it at the beginning. They work great and are 100% reliable. Bottom line.. the vacuum hubs were a great idea that just plain did not work reliably. Save yourself alot of grief and money and just replace the hubs. Less than $200 including paying someone to put then on and I now can rely on my Sportage when I need it.
Posted on Mar 06, 2009
Hi, You will need to take to mitsubishi dealer and have them scan your diagnostics. But this is a common thing in montero's and it sounds like o ring (which is plastic) in transfer case has busted. As long as it switches in and out of 4 wheel drive it is ok to drive. If it doesn't, dont drive it...it could cause alot of damage.
Posted on Aug 04, 2009
SOURCE: 01 suburban 4x4 wont work.
On the full size, the front actuator is electric, not vacuum.
When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.
Check voltage at the connector for the front actuator (at the front differential - it looks like a large bullet that threads into the front diff.) If it has 12 volts, the actuator is the problem. If it does not have 12 volts, check the transfer case switch and the power feed to the transfer case.
I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD.
GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.
If I were you, I would buy a new heated actuator. They are available at most auto parts stores, and are about $90. They are also on eBay for about $55 plus shipping. These are very easy to change - just thread out the old one, and thread in a new one.
Good luck, That actuator is usually the problem 90% of time.
Posted on Dec 09, 2009
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