Question about 1989 Jeep Cherokee

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The 4x4 will not engage the part time light comes on but no 4x4 under the radiator resevor there is 4 vacum lines found the blue vacum hose not conected cant find where it should be conected too can anybody help

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On the right side,back side of the axle there is a vacuum motor,thats where it goes

Posted on Jan 31, 2010

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Chevy blazer 2005 zr2 will not go into the 4X4 option either hi / lo or auto 4X4 press the button into each one and all it does is keep blinking and will not engage into 4 wheel drive


under your batt tray needs removed youll find a rubber hose goin to a vacume canastersee that it aint cracked or got a hole

Oct 27, 2012 | Cars & Trucks

1 Answer

4wheel drive will not engage


There are three main things that could cause this. #1: in the passenger side kick panel is a module that controls the 4x4 and it should be clicking as you try to put it in 4x4.#2:There is a vacume activator switch on the transfer case located on the top on the drivers side.(If the module is clicking and trying to put it in 4x4 then I would just go to this activator switch).#3 If you replace the switch and it still dosn't go in to 4x4 there is a vacum diaphram under the battery tray that pulls the front end into 4x4.Check and make sure that there is vacum getting to the diaphram which is controled by the activator on the transfer case.If no vacume at the activator or diaphram check all the vacume hoses going into and out of the activator.If no vacume while vehicle is running suspect bad vacume line.You will need to remove the battery to test the diaphram under the battery tray.You will need to hook up some kind of battery to the cables with the battery out of the car to get it started in order to check for vacume at the diaphram.

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97 expedition - 4x4 does not engage


i have the same problem can't figured it out although when i turn the knob to AWD the light on dash just flashes. the 4x4 H and 4x4 L light on dash stays on.if u have found out anything please let me know or e mail me at bigd6923@yahoo.com Thanks Don

Jan 28, 2010 | 1997 Ford Expedition

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1995 dodge 3500 4wd wont engage have shifter on floor light wont come on or 4wd wont engage


Any time your dealing with a 4x4 system the best start is at you front axle. Its primarily a vacuum leak so check to see if the 2 vac lines are hooked up (its good to check the electric connections.). When your 4 wheel drive is engaged and the motors running you should have vacuum at one or both of thee lines depending on if your in 4 hi or low .
If no vacuum at axle check the Vacum switchs(the plug with 4 vac lines) on top of the transfer case it will have 2 feed lines(grey & green) they conect in to the into the vacum harness on back of motor (passanger side). A vacum schematic is normally located on the raditor core support (right under the hood next to hood release)
Hope this helps

Jan 20, 2010 | 1999 Dodge Ram 2500 4WD

1 Answer

I just bought a 98 Dodge Ram 1500 4X4. It is making a howling/growling sound when it's in 4 wheel drive. High or low range. I haven't driven it very much yet and never noticed it till today. The 4X4 light...


u ever try the vacum line or the vacum chamber i have a 98 dodge ram with the same problem with the 4x4 and i had to replace the vacum chamber and vacum line

Jan 03, 2010 | 1998 Dodge Ram 1500 4WD

1 Answer

4x4 lights flash dont engage


I have a 2001 chevy blazer and for the last three years when i tried to engage by 4x4 the light would just flash, in any mode, low, high, or auto. I found a vacuum hose disconected located near the top center of the firewall. I plugged it in and i was good to go. After researching I found it is a common problem. The hose goes to the actuator under the battery.

Dec 07, 2009 | Chevrolet Blazer Cars & Trucks

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Elec 4 wheel drive light comes on but 4x4 not engaging


change the 2 solenoids on the firewall on the passenger side. they contol the vacum to the acuator.

Jan 27, 2009 | 1999 Ford F150 Regular Cab

1 Answer

Four wheel won't engage


Theres a vacume dash pot under the battery box. It pulls a cable that engages the front diff. Put the vacume line and you'll have lights and four wheel drive. (it happened to my blazzer)

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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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