Question about 1995 Jeep Grand Cherokee

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Front axle vacum hose is connected to the axle and was wondering where it needs to be connected to

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If the hose you are looking at attaches to or very near the bulge in the axle where the gearset is located, you are looking at the vent hose. You can attach it to the firewall, anywhere higher than the differential. Factory location is usually on the drivers side of the engine between the master cylinder and the engine on the firewall. They usually have a vent cap on the end to keep water out but when it falls down and hits the road the cap is often lost. You can make a cover using a small bottle cap and a 3" sheetrock screw drilled through it's center. Just slide the screw into the hose so the cap sits on top (it won't fit tightly and shouldn't but it will keep debris out of the hose)
If you have a differential control box on the right side axle with more than one vacuum hose on it (unusual on GC's) then you will need a vacuum diagram to find the connection points.

Posted on Mar 15, 2011

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2 Answers

Why is there no vacuum in 4wd system?


http://www.wranglerforum.com/f218/vacum-diagram-90-yj-with-4-2-a-89703.html page 5

Apr 02, 2016 | 1990 Jeep Wrangler

1 Answer

I have a 91 jeep wrangler the 4 wheel drive stop working iv check the vacume hoses and they r good iv trace them bact to transfurcase to the front intake iv got vacume to the hoses by the batter but none...


first off what does that mean? 91 command trac system.
1: light dead in dash. ( means squat)
2: shift lever will not move. (i guess its ok)
3: tires actually do not turn on 4 ends of axles. (guess fails)

we cant guess, what tests fail, you must say.
do you have drive on the front prop shaft,
from transfer case to the front axle.?
91 books are hard to find, but alldata.com does cover it.
ever read the FSM or alldata.com its there.
my guess is you are saying the shift motor is dead/. that it?
this?



25543740-y0lpcx5ujcsqxilomiw3wt0j-2-0.jpg if yes, did you do the steps in the FSM book yet>? read it?

  1. Raise and support the vehicle safely.
  2. Disconnect the vacuum harness and connect a hand vacuum pump to the front port. Apply 15 in. Hg (381mm Hg) of vacuum to the front port and rotate the right front wheel to fully disengage axle shafts.
  3. The shift motor should maintain the vacuum applied to the front port for a minimum of 30 seconds. If the motor does not maintain the vacuum, replace it. If the motor does maintain vacuum go to Step 4.
  4. Connect the vacuum pump to the rear port. Cap the port for the indicator lamp switch and apply 15 in. Hg (381mm Hg).
  5. The shift motor should maintain the vacuum applied to the rear port for a minimum of 30 seconds. If the motor does not maintain the vacuum, replace it. If the motor does maintain vacuum go to Step 6.
  6. Remove the cap from the port for the indicator lamp switch and determine if vacuum is present. If present, the shift motor is functioning properly. If not, proceed to Step 7.
  7. Apply 15 in. Hg (381mm Hg) of vacuum to the shift motor rear port. Rotate the right front wheel to engage the axle shafts. The axles must be completely engaged!
  8. Determine if vacuum is present at the port for the indicator lamp switch. If present, the shift motor is functioning properly. If not, replace the shift motor.
85357331.gif tests: this is just a vacuum servo , called a motor by jeep, its not a motor of any kind its a vacuum servo actuator.
it can be removed and bench tested, easy. just like all servos




25543740-y0lpcx5ujcsqxilomiw3wt0j-2-1.jpg

Mar 09, 2015 | Jeep Cars & Trucks

1 Answer

91 jeep wrangler it wont go into 4 wheel drive iv check the vacume hoses and they are good its getting vacume but no vacume to the front mod where do i go from here ? iv trace them back to front and all...


im answering a 2nd time.
the part time has a vacuum motor (a slave, vacuum servo actuator not unlike you see on HVAC but stronger it is)

so of the motor operates , does it?
then its good and axle parts are bad
if the slave fails to move, or is weak or short strokes its bad.
but you never did a classic test called a leak down on the slave.to
find, a cracked diaprham.

you can do lots of things, and here they all are.
but you need a $20 hand vacuum tool to fix vacuum systems.
do you have one, if not buy one at harbor freight.

1: LEAK DOWN TEST IN VACUUM SIDE OF SLAVE MOTOR
must hold a vacuum for 30 seconds, if not its bad.
easy huh.
at the same time you see the actuator rod suck in, does it fully?
off car?
2: you can connect a hose from tool to the on car slave.nipple directly then pump up to 20 inche Vac or more,
the slave then move the shift fork to lock, if that works ok
then the axle and slave or not.
if the slave fails to move the fork, then the slave is weak or the forks jamming.
3: if all above works then the vacuum sourcing end of car is bad.


chapter Axles + front + 4wd, in the FSM covers this,
its real easy to add vacuum to nipple 7,


25543654-chr3aovywzb4jn10ubo0w1hk-1-0.jpg

Mar 09, 2015 | Jeep Cars & Trucks

1 Answer

The 4wd will not engage on 2004 tundra


you probably have a vacume leak , there is a control harness that runs from the front axle up on the transmisson , usually with 4 little hoses attached and it plugs in at the transmission, that is where the vacume comes from , that is where I would start

Aug 16, 2010 | 2004 Toyota Tundra

1 Answer

1998 gmc sonoma 4 wheel drive not working. Front axles clink when button pushed. Transfer drive shaft not turning when jacked up . Don't see any vacume leaks on switch and vacume lines not filled with...


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.

Mar 04, 2010 | 1999 GMC Sonoma

1 Answer

THe 4 wheel drive shows that it is engaged but it is not. We just replaced the axels on the front and it still does not work. HELP!!!!!!!!!!!!!


Why did you replace the axles. Just wondering because I was about to buy one, nissan ,not an axle.. I would say maybe something was not put back during the axle R&R if you had 4 wheel previously. That doesn't answer your question but my two 4x4's have vacuum hoses and some veh have selonoids that go to the front axle to operate whatever mechanism moves the fork in the axle ,to connect to one side off the diff. Keep in mind that you really only have one axle driving in 4x4,both front and back ,unless you have an aftermarket airlocker.

Feb 08, 2010 | 1995 Nissan Pickup

1 Answer

Four wheel drive not working on 1994 chevy blazer


I had a 90 S10 4X4 so I hope I can help. The front axle on this truck is locked by cable. The housing for this cable is found behind/around the battery. I found the vacume hose was falling off the plug and was not locking the front axle. When the truck is put into 4wheel, you can check the locking of the front axle here. Now if everything is working there, you might want to check the the transfur case is working. If the truck has electric it will have a electric motor on the side of the transfur case. If you have a manual shift on the transfur case then you would have to make sure that the rods are moving and locking into place. Hope this gives you an idea as to where to start looking.

Mar 15, 2009 | 1996 Chevrolet Blazer

2 Answers

1989 Jeep Cherokee Pioneer 4wd problems


Most Jeeps are mechanically shifted, not vaccum.

If it is mechanically shifted, simply check your linkage underneath.

That's after you check you front driveshaft and make sure it's working, and there. I've known people to steal em.

If it is vacuum operated, then I'm at a loss.

Feb 01, 2009 | 1989 Jeep Cherokee

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

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