Question about 1989 Jeep Comanche

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89 comanche 4.0 vacuum line disconnected near passenger headlight - no cruise control

Vacuum line is disconnected and has a 90 degree fitting on end but cannot find location it attaches to. has vacuum when engine is started. jeep does not have cruise control and hose comes from "T" connecter for HVAC system.

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You should have a vacuum line diagram under the hood of your car you can buy the haynes repair book for your vehicle at any autozone or advance auto someplace like that

Posted on Mar 28, 2013


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Posted on Jan 02, 2017


Richard Scordino

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SOURCE: Hose connection location

If you look under there you should find a steel or plastic line that runs up to a place inside the engine bay.( If it is connected directly to the differential) If it is connected to a box mounted on the right side axle it is part lof your 4x4control and should carry vacuum. With engine running you will hear vacuum leak and easily find connection point.
(but you didn't mention any driveline problem so it's likely the first, which is only a vent line. as long as it is not pointing foreward or straight up it is also ok to just secure it out of the way. (but not where it will become submerged in water etc.

Posted on Jan 24, 2009

Richard Scordino

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SOURCE: Need diagram of vacuum system for 1988 jeep comanche pick-up 6 cy

Haynes manual has a diagram. Main important hookups are to power brake booster, fuel pressure regulator and map sensor. also need a connection to a/c controls inside drivers compartment and evap system canister. will also need connection to egr valve solenoid if you have one. as well as pcv on valve cover (or ccv which replaces pcv on some)

Posted on Mar 04, 2009

Richard Scordino

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SOURCE: '89 Jeep Comanche Fuel pump not pumping fuel.

If the pump is running with the key on, and you have a hose coming from the pump with no obstructions in the way (such as a fuel filter) and there is no fuel coming out of that open hose, then you need to remove the pump and find out why. It cannot run without pumping something out of the hose (unless you have it connected to the wrong hose (vent or return line) Voltage is important, but if it's running even if volts are low, it still will move some fuel.

Posted on Aug 15, 2009

Richard Scordino

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SOURCE: On my 1993 Jeep Grand Cherokee the vacuum line

If it's attached to the diff housing and not to the box on the r/f axle (if you have one) it is a vent hose. Just secure it anywhere out of the way on the firewall. Don't pull it tight or when the axle moves it will fall off again!

Posted on Oct 09, 2009

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Why does my 89 jeep comanche 4.0 have a high idle upon start and sometimes while driving. t has been only doing so upon sart but now it does it randomly while driving.

Most vehicles have a high idle until the engine gets hot. As for your random problem, might want to check for any vacuum leaks that could cause this problem.

When checking, best to do with cold engine. Start your vehicle and spray short amounts of starting fluid near vacuum hoses, if idle changes, you may have a leak. Keep away from exhaust manifold if at all possible. Also spray near intake hoses and air filter housing.

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Cruise control

At the Controller end or the manifold end ?...most connect to a inline T somewhere near the unit..or at the manifold...follow the vacuum line from the unit to the manifold, or close to the manifold where it should hook up...look for crack's in the line or breaks at the T...

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Where is vacuum hose for cruise control 95 dodge dakota

On the 95 5.2 318 SLT it comes off the passenger side of the intake manifold around middle ways under the center section bellow the throttle body.From there the vacuum line goes through a one-way "in-line"directional valve.The valve has the black side to the vacuum port of the manifold. It there goes to a "T" fitting.One hose on the "T" goes to the driver side through the firewall to regulate air flow in the cab.The other side of the "T" goes to the air ball next to the cruise control servo on the firewall. This hollow ball stores 10" of vacuum to operate the vacuum diaphragm of the cruise control servo. Hopes this helps. Jimmy

Feb 20, 2012 | 1995 Dodge Dakota

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Cruise Control suddenly stopped working. Is there a fuse or something I could check?

HI, your cruise control is both electrical and vacuum operated. The fuse you find in the under hood fuse box, it will be a 20amp yellow fuse in position 23. A diagram of the fuse box should be under the lid covering it. the other thing to check is if your getting vacuum to the control servo this is located on the passenger side inner fender well. gently disconnect the vacuum line and with the motor running check to see if you can feel vacuum at the line. Hope this helps. good luck

Aug 26, 2010 | 2000 Jeep Grand Cherokee

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Cruise controll not working

Here is a posting from another site, I suggest read it...

I posted on Thursday about my 2001 Cherokee Sport - thought I would give an update on here that may help someone else.

After thinking about things alittle more -
Symptoms -
* All air going to defroster mode
* Cruise Control not functioning
* Check engine light on. Code decoded as "small vacuum leak"

Well, I had been researching and know that the air blend doors are vacuum controlled. I discovered that the Cruise Control is also vacuum controlled. This along with my check engine light "small vacuum leak", led me to believe that all are related.

As this is my wifes vehicle, I am not sure if all happened at the same time or not. As most know alot of women do not pay attention to anythingto have details to provide the husband in proper diagnosing - other than "it dont work - fix it"

I pulled it into the shop yesterday and just looked under the hood not knowing where to start. I mean, a vacuum leak doesn't flash a red light saying fix me... So after another cold beverage, I started pushing and pulling on vacuum lines, disconnecting and blowing in them. Nothing! Ok, another cold beverage ... I grabbed another line and was disconnecting a line from a t-fitting and the whole thing came loose... the end was broke - WaLa ! It was the vacuum line that runs inbetween the passenger fender wall and the battery behind the headlight. What had happened I assume is, because the tie that held it to the fender was broke, is when I changed the battery last year, the line was in the way and broke ? So I made a hose patch for it, got it all back to gether and checked it out - No more check engine light, got air in all directions!

So, I tell the wife to come out and I need her help. I told her to get in and start it and wait for my commands... She gets in (I set the ac to max), starts it and looks at me, I just stand back for a sec - finally she realizes she has ac blowing in her face ! Then I had to point out the engine light... I took a drive and the cruise now works as well !

Well, I got lucky ad found where my vacuum "leak" was and got it fixed.

Time spent researching: 2 hours
Time spent repairing: 30 minutes
Total cost:.25 cents (tape and piece of hose)

Hope helped.

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Check around the intake area, The cruise control vacuum should be connected near the intake of the engine. is a link to purchase the manual for the vacuum line routing

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The pump is located on the passenger side of the engine compartment, back by the firewall. Look in the middle of the firewall by the cowl and you'll see a small plastic line going into the cowl. follow it back and you will come to a T fitting. Follow it to the passenger side and it will go into the Vacuum pump that controls the Cruise control.If you follow it to the other side, it goes under the Battery box. this is where the Servo for the cruise is located. Check the lines for small cracks, wear spots or even breaks. The plastic line can get beaten up pretty easily.
The easy way to see if it is your vacuum pump, turn the key on and listen. you will hear 2 distinct sounds. The first sound will stop in about 15 - 20 seconds. (fuel pump?) the second sound is the vacuum pump. If it turns off in 45 seconds to a minute (or slightly longer) the vacuum pump is probably ok, as are the plastic lines. The sound of the pump stopping means that vacuum has been achieved and is holding vacuum. If it keeps running, the pump is bad or the lines have a break in them. If the lines have had a hole in them for a long time, the diaphragm in the pump will have gone south. This is not a servicable part and the pump will have to be replaced. The pump is available from a dodge dealer but most likely the parts guy will not have a clue as there is no picture in their manual and a very poor description. When talking to them ask for a "03 Ram 2500 CUMMINS Cruise vacuum pump"
The part costs $212.70

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Look on the drivers side of the intake manifold to see if the vacuum line fell off. It will be a 90 degree elbow coming down from the firewall area.

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I do not have a vacuum diagram for the 89 Cherokee, but my 89 had the same issue several times and all it was is that the block of vacuum lines that go into the front axle on the rear of the axle on the passenger side of the vehicle. I ended up having to put a zip tie around the axle and hose block to hold it on. Have not had the issue again since doing this. Hope that helps.

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