We had a huge snow storm last week and my wife put it in 4X4 and when she took it out and back into 2hi the switch lite up 2hi and its out because when i turn on dry pavement its not walking,So she tells me that the fuel milage went down so i took it for a cruise and it feel like im towing a trailer like its dragging so i opened the window and sounds like the axles are turning like the transfer case is disengaged but the axles are not,, HELP !!!!,,, very mech inclined just do not know this system
SOURCE: 2000 gmc yukon xl 4x4 wont engage
see my posting re this at my name: rlf107. $115 in parts and labor solved for me, on a 2000 Yukon XL
SOURCE: 1995 gmc yukon wiyh 6.5 diesel 4 wheel drive will
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. The actuator is usually the problem 90% of time but recheck all
of the wire harness just to maker sure there is no short before
replacing any parts.
Testimonial: "This is exactly the info i need to troubleshoot and repair efficiently complete with wire numbers and colors thanks for the help buddy"
On
these issue, there are few solved help links for troubleshooting the
issue easily.-------
Click
the link below: ---
http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html
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http://schematicsdiagram.blogspot.com/2012/01/4x4-truck-makes-roaring-noise-in-front.html
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http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html
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http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html
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http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html
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http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html
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http://technoanswers.blogspot.in/2012/06/2002-jeep-wrangler-4wd-idiot-light-is.html
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Traction
control switch will not engage on 4WD High or Low
http://whoisbyme.blogspot.com/2012/10/traction-control-switch-will-not-engage.html
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4WD light
flashing and 4WD will engage after few minutes
http://repairhelpcenter.blogspot.com/2012/10/4wd-light-flashing-and-4wd-will-engage.html
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http://technoanswers.blogspot.in/2012/05/2008-toyota-tundra-4x4-wheel-drive.html
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http://technoanswers.blogspot.in/2012/02/4x4-front-differential-will-not-engage.html
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http://technoanswers.blogspot.in/2012/09/dodge-ram-4x4-light-keeps-flashing.html
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http://technoanswers.blogspot.in/2012/02/ford-4x4-front-wheels-will-not-engage.html
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These
details will help.
Thanks.
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