Question about 1987 Dodge D150

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4x4 will not ingage they say theres vacum lines but cant seem to find

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Yes vac controlled look on top of front diff follow lines up bet youll find broken/burnt vac hose

Posted on Feb 05, 2010

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The air flow vent is stuck on defrost mode. when i switch to a/c or face/floor no air is directed out. the fan seems to be working fine


The air direction is vacum controlled. If you have 4X4 and ESOF ( switch in the cab) then you need to inspect the vacum lines that go to the hubs and possibly the hub seals. "default" position for air flow is the defrost position. If you DON'T have 4X4, and it's a diesel engine, inspect the vacum pump, If it's a gas engine then look at all the vacum lines from the intake manifold for a leak.

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Check front wheels there is 2 pipes going to the wheels 1 is for brake fluid to the callepers and the other one is for vacume suction to ingage or dis ingage the free wheel function 99% of the time this pipe is leaking or it is broken. enjoy !! Willem SA

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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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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

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I have a 4x4 1999 dodge ram the 4x4 work great but the 4x4 light whon go out


the 4x4 switch is located on the front axle in a vacume operated pod near the passenger side. the main cause of the light staying on is a vacume leak .check the lines for cracks or something could have knocked them off. follow the lines from the axle to the trans to make shure

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1 Answer

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its a vacume operated cylinoid on the top of your transfer case. has three vacume lines to it. replace. could also be your vacume lines to that switch. check usally they touch the exhaust manifold and put a hole in it check that as well.

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there is a vacume operated switch on top of the transfer case replace that or check vacume lines they might have a hole in them.

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1996 JIMMY / 4 WHEEL DR DOESN'T ENGAGE but LIGHT TURNS ON


Check the vacume line to the accuator for the cable, mine was rotted and busted. Replaced it . it goes under the battery. Problem solved

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4x4


It's probably just bound up to drive train, (Driving in 4WD on hard ground hey?)
Put vehicle in reverse, travel in a straight line for about 10-20 metres, this should free it up.

Aug 09, 2008 | 1996 Isuzu Trooper

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