Question about 2002 Mercury Mountaineer

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Front axle won't engage is all wheel drive - 2002 Mercury Mountaineer

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Check this link they have a very good answer to your issue.
http://mercury-mountaineer-repair.10w40.com/questions/awd-issues

Posted on Nov 21, 2014

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If it is electronic shift i would say the 4wd actuator/motor is seized. I have come across this problem a lot. Once winter is over people don't use there 4wd. So the little motor sits for months and seizes. I recommend people turn the button every week just to keep it freed up. Same as a hand brake. If it's not used it gets seized.

Posted on Nov 19, 2014

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1 Answer

Is there an electric or vacuum switch on a 2001 chevy blazer


There are 2 models here the push button will flash if the system is not engaging or disengaging properly . If front drive shaft is turning. That is with car raised and supported . if front drive axles do not turn then the axle actuator is not engaging axle shaft passenger side. Remove actuator and manually engage shifting collar with a screwdriver still does not turn then inner axle is twisted.

Mar 21, 2014 | 2001 Jeep Grand Cherokee

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2003 gmc envoy 4x4 problems. 4200 vortec engine. my front diff doesnt seem to be


The Selectable Four Wheel Drive (S4WD) Front Axle consist of the following components:
• Differential Carrier Housing
• Differential Case Assembly
• Inner Axle Shaft
• Intermediate Shaft Bearing Assembly (located on the right side of the oil pan)
• Electric Motor Actuator
The front axle on Selectable Four Wheel Drive (S4WD) model vehicles uses a disconnect feature mounted on the right side of the oil pan in order to engage and disengage the front axle. When the driver engages the 4WD system, the Transfer Case Control Module sends a signal to the electric motor actuator to energize and extend the plunger inside. The extended plunger moves the clutch fork and clutch fork sleeve across from the clutch fork outer gear that is splined to the right side wheel drive shaft to the clutch fork inner gear that is splined to the inner axle shaft. The locking of the two gears allows the axle to operate in the same manner as a semi-floating rear axle. A propeller shaft connects the transfer case to the front axle. The differential carrier assembly uses a conventional ring and pinion gear set to transmit the driving force of the engine to the wheels. The open differential allows the wheels to turn at different rates of speed while the axle continues to transmit the driving force. This prevents tire scuffing when going around corners and premature wear on internal axle parts. The ring and pinion set and the differential are contained within the carrier. The axle identification number is located on top of the differential carrier assembly or on a label on the bottom of the right half of differential carrier assembly. The wheel drive shafts are completely flexible assemblies consisting of inner and outer constant velocity CV joints protected by thermoplastic boots and connected by a wheel drive shaft.

How To Install Repair Replace 4x4 Front Axle Actuator Chevy Trailblazer...

May 11, 2017 | 2003 GMC Envoy

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2005 Trailblazer XT won\'t go into 4WD. Front hubs don\'t engage with switch in cab. It will gear down to 4wd Lo but front wheels won\'t engage. Please help. Can\'t afford the dealer!


i've been told it was the 4wd actuator located on the passenger side near were the cv joint goes in to the front axle a good test is to floor jack it up so both wheels are off the ground and have someone on the other side , put in nutrual turn both wheels one way at same time and the 4wd drive shaft should turn if not its your actuator, costs about $86 for anew actuator and takes about 5 mins to change once you have the tire off

Feb 11, 2011 | 2005 Chevrolet TrailBlazer

2 Answers

Every time i push the button for the four wheel hi it makes the click noise in the front but DOES NOT ENGAGE. only the back tire spins


Depending on the year, it is not posted, it may be a bad transfer case motor. The clicking you are hearing is the motor trying to engage transfer case & front axle. It looks like a windshield wiper motor & when it gets power & works properly it engages front wheels. Again, depending on the year, may be 4 wheel drive actuator or switches bad on front axle or transfer case.

Jan 17, 2011 | GMC Jimmy Cars & Trucks

1 Answer

My 2001 ford supercrew wont engage into 4 wheel drive


Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

If the front axle does not turn, the cause generally has to do with the Vacuum disconnect motor on the axle ( Item #10 in this picture ) :
sscullys_0.gif
Close Up :
sscullys_11.jpg

The vacuum disconnect motor is operated by the vacuum axle disconnect solenoids on the firewall
sscullys_12.jpg

You can test from here with a vacuum pump ( i.e. mightvac ) to see if the vacuum lines to the vacuum disconnect motor are good.
The pink vacuum line is 2WD operation, the Light Blue vacuum line is 4WD operation.
If the vacuum lines test good from here to the disconnect motor, and applying vacuum locks the front axle, it is either the vacuum solenoids, or the vacuum reservoir behind the battery, or the vacuum lines to the solenoids.
The solenoids have + VDC all the time, and the GEM applies ground to the correct solenoid to engage or disengage the front axle.

Nov 06, 2010 | 2001 Ford F150 Styleside SuperCrew

1 Answer

I have a 1997 5.7 Liter Cheverolet Z71. The 4 wheel drive is not engaging. I can hear the trasfer case engage and can even hear the difference in the transmission when in 4 Lo/hi when driving. However...


Having 4 wheel drive is not actually the case unless you have limited slip on both axles. Do you know if one wheel will spin on both axles. If you can't get either wheel to spin on the front axle and one will spin on the rear then I would agree your not getting front wheel drive. Since you can tell a difference between hi/lo the transfer case is definitely engaging

Dec 25, 2009 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Four wheel drive wont engage. Tranfer case is


Sounds like you either have a vaccum leak or your 4 wheel drive actuator is not working to engage the front differential.On my 98 ram there is a black and red plastic lines that are used for the vaccum lines. They are underneath and go from the transfer case to the front axle, check to see if one or both might be cracked or broke completely.If the lines are good then it could be your actuator on the front axle. A new one is about $93 at advance auto parts and not very hard to replace

Dec 15, 2009 | 1998 Dodge Ram 1500 4WD

1 Answer

4 wheel drive wiil mot engage


check the hoses on the front axle they are what really engage the 4 wheel to the front axle check for cracks or replace entire line i had that problem before sometimes not enough vaccum pressure

Dec 14, 2009 | 1987 Dodge Pickup 2WD

1 Answer

Front axle stuck engaged


w9fro..In1995, and other model years, the actuator used to engage the transfer case into four wheel drive is oil filled with a heating element.
When you select four wheel drive the element heats up, the oil expands and engages the transfer case. Unfortunately if the actuator fails, the truck remains in four wheel drive. GM has an improved actuator so the problem does not repeat.
As always, check the basics, power, grounds and switch at floor select before replacing the actuator.
Also, if the truck is truly stuck in four wheel drive, you can tell by turning the truck in a tight circle. If the front end wants to "bunny hop" it is definitely engaged.
Best of luck, let me know.
Regards,

Feb 10, 2009 | 1995 Chevrolet K1500

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