Question about 1991 GMC S-15 Jimmy

1 Answer

4 wheel drive went out in my 91 s-15 jimmy

One day it worked, next day it didn't. Was told that something on top may have rusted thru or a hose may have come off, but with out a diagram I don't know where to look

Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 13 Answers

Several places to check first one is the vac line on the ball mounted to your hood. if its ok then under the truck on the transfercase is the vac switch disconnect it and check for vac.. if you have it put vac line to actuator its uner the right innerfender it controls the front diff lock.. if its functioning then you just ned to replace the vac swithc in the transfercase its just screwed in.. the lines to the 4x4 system are plastic and rubber mostly..

Posted on Jan 20, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

4 wheel drive on my 89 jimmy goes in 4 wheel drive

First check plug on actuator on front differential and be sure that plug is securely fastened to sensor and that plug has no rusted or corroded pins. Then test actuator and be sure it is operating properly. More than likely your four wheel drive actuator is malfunctioning.

Sep 09, 2014 | 1989 GMC S-15 Jimmy

1 Answer

1999 pontiac firebird clicking noise

don't ram it into a pole, that seldom helps the ticking.
get a pressure test done to be sure the oil pump is functioning as it should, motor flush is not always a good idea but if it helped then it probably didn't get rid of all of the sludge, if a lifter collapses, it will always tick no matter what you do, if it is an oil pressure issue the tick can come and go.
one thing to consider, sludge happens from poor maintenance, it can hide other issues, clearing out all of the sludge can cause an engine knock if the bearings are worn.

Oct 26, 2012 | Pontiac Firebird Cars & Trucks

2 Answers

Need vacuum hose diagram for a 1997 gmc jimmy, have hose that appears to be coming from the transmission/transfer case area. It is hanging out right next to the brake fluid reservoir. I don't think it

Hmmm, go down and look at that transfer case: that same hose should connect somewhere there (that's what activates the 2WD shift out): either that, or it should go through the solenoid, and then to the transfer case. The best place to find such a diagram would be a Chilton or Haye's manual, either are invaluable to vehicle service.

Dec 03, 2011 | 1997 GMC Jimmy

2 Answers

I have 2004 Yukon and have a strong gas smell but no apparent leaks. No check engine lights are on and no codes when tested. Been told it may be EVAP filte...engine comparment was recently...

I just had my fuel sending unit replaced for this same reason. The top of the unit where the lines connect rust and begins to loose gas preasure. However the gas pump and sending unit cannot be purchased seperatly it will run you about $300.00
My problem persisted long enough for the Check Engine Light to come on though Now i have to learn how to reset it..

Jul 28, 2011 | 2004 GMC Yukon

1 Answer

The front wheel drive of the all wheel drive quite. Could it be a relay or fuse

It depends on if you have an eletronic shifter or a manual shifter for the transfer case. Do you have a lever or a push botton to shift into 4 wheel drive. And how did it go out i mean were you driveing it in 4 wheel and it went out or were you one day trying to put it in 4 wheel and it didn;t go in

Jan 21, 2011 | 1999 Oldsmobile Bravada

1 Answer

The air blows but it don't heat like it suppose to nor do it allows the defroster to work. it a 2000 gmc jimmy 4-wheel drive someone says it may be the heating core

Sounds like a vacuum activated switch. Your engine vacuum is used to open and close little doors in your vents. If a hose is loose or disconnected or the electronic controls that tell the switch to let vacuum thru is not working, no air will reach your defroster vent at the windshield. Does the switch that controls Vent, Heat (sends to the floor), AC and MAX AC do anything at all? If they do, you may have a specific switch problem. If you switch from Vent to MAX AC the sound of the air flow should be much louder. If the switch isnt changing where the air blows, it is leading you to the problem. Either the switch is bad or the supply of vacuum to the switch is not there whether it is a loose vacuum hose or a disconnected one. Happens often when aftermarket stereos are installed and the installer disconnects something either by accident or forgets to reconnect it.

Apr 09, 2010 | 2000 GMC Jimmy

1 Answer

What would cause my 1999 vw beetle turbo exhaust to seperate? i was driving from the used car dealership the day i purchased it and only 20 miles away from the dealer it started making a very loud noise...

the problem is called rust and as exhausts rust from the inside you were just unlucky....sorry.the check light would have come on at the same time as it went.

Mar 07, 2010 | 1999 Volkswagen Beetle

1 Answer

1994 GMC Jimmy- 4wheel H won't engauge

ive heard more than once about this problem ive been told its something in the switch itself easy enough to change out hope this helps

Feb 24, 2010 | 1994 GMC Jimmy

1 Answer


sounds like you have a combonation trans and transfer case issues. if you were running youre truck in four wheel on a hard dry surface, witch is not recomended , the trans probibly ran hot. as for the transfer case, it could be a combination of problems. dash switch/ actuator/vacum switch/ vacum canister witch is under the battery tray. all have to work in unison. service the trans first. if the truck has high miles, add trans conditoner, if you do not, it will slip. then the transfer case. refer to youre owners man for oil specs. youre problems are not uneque as these trucks are notorius for unreiable four wheel actiuation. hope i was some help.

Oct 27, 2009 | 2000 GMC Jimmy

2 Answers

1996 blazer wont go into 4 wheel drive

Try replacing the vacuum lines that go to the transfer case from the engine. I had the same problem on a 95 Jimmy and was told to do it.... I changed every piece of vacuum hose that had anything to do with the 4x4 and it worked. Hope this helps you out

Jan 20, 2009 | 1996 Chevrolet Blazer

Not finding what you are looking for?
1991 GMC S-15 Jimmy Logo

Related Topics:

116 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

77169 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22258 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides