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Front Drive Axle Vacuum Actuator Solenoid Valve?

Tiny
JUSTIN ADAIR
  • MEMBER
  • 2000 GMC JIMMY
  • 170,000 MILES
I have a 2000 GMC Jimmy 4X4 The Vacuum Actuator Solenoid Valve hoses are disconnected and dry rotted. I can not find a diagram where these hoses go. Can anyone please help. There is a picture of the solenoid valve in the link below.
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Monday, September 26th, 2011 AT 2:39 AM

25 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
I caon't find a schematic. However, from the actuator it should go to a vacuum canister near the transfer case.
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Monday, September 26th, 2011 AT 2:46 AM
Tiny
JUSTIN ADAIR
  • MEMBER
  • 42 POSTS
Hopefully someone else will chime in and be able to help. Thanks! I heard something similar but that goes for 1 hose?
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Monday, September 26th, 2011 AT 2:50 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
How many are disconnected or damaged?
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Monday, September 26th, 2011 AT 2:56 AM
Tiny
JUSTIN ADAIR
  • MEMBER
  • 42 POSTS
As you can see by the image above there are 2 hose ports on the solenoid valve the top one goes somewhere on the passanger side and the bottom head over to the driver side and conncets to a splitter the hose directly across is damaged I can take pictures tomorrow. High quality.
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Monday, September 26th, 2011 AT 3:00 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Do that. I may be able to figure it out by looking. If I recall, one is going to a switch on the transfer case too. It is used to turn on the indicator light inside. The others are most likely to the canister and one to intake vacuum.

I'll do my best.
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Monday, September 26th, 2011 AT 3:54 AM
Tiny
JUSTIN ADAIR
  • MEMBER
  • 42 POSTS
Okay I went out with a light and my phone and these are the best pictures I could get. The first picture is the acuator vacuum solenoid valve the second is the hose going to the drivers side and the third is the one on the passanger side.
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Monday, September 26th, 2011 AT 4:12 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
I can't see the intire picture because the message block (that I am presently typing in) covers it. I have asked another tech if he has access to the 4wd diagram. Lets see if he comes through.
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Monday, September 26th, 2011 AT 4:30 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Hey guys, this is the only vacuum diagram I could find.
Justin is right: one vacuum line will be supplying vacuum from the intake or a ported vacuum valve. The other side will go to the indicator and to the transfer case. What condition are the vacuum lines on the other side of the "T"?
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Monday, September 26th, 2011 AT 5:33 AM
Tiny
JUSTIN ADAIR
  • MEMBER
  • 42 POSTS
Okay in the second picture I miscommunicated where the hose goes. The hose come from under the intake manifold towards the driver side the second T connection is where the hose goes from that solenoid valve. Thanks!
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Monday, September 26th, 2011 AT 5:44 AM
Tiny
JUSTIN ADAIR
  • MEMBER
  • 42 POSTS
Okay I also forgot to note that the hose on the driver side constantl sucks air when the car is on and the one towards the passanger side only sucks when the 4X4 is turned on.
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Monday, September 26th, 2011 AT 6:03 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
The solenoid passes vacuum when it is energized, or when the vehicle is in 4-wheel drive mode. The driver side hose supplies engine vacuum to the solenoid. From there it should go to the transfer case.
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Monday, September 26th, 2011 AT 6:06 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Is it possible that the vacuum hose from the solenoid sends vacum to the front axle when switched? The switch on the transfercase is moved when the transfer case is shifted.
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Monday, September 26th, 2011 AT 4:05 PM
Tiny
KHLOW2008
  • MECHANIC
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If the vacuum hoses are not installed correctly, the vacuum would not release when the switch is turned off. The manifold vacuum hose should be connected to the outer port of the solenoid.
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Monday, September 26th, 2011 AT 4:45 PM
Tiny
JUSTIN ADAIR
  • MEMBER
  • 42 POSTS
Okay the hose that comes out from the manifoldconnects to the top T as displayed in the pictures then the hose directly across goes somewhere on the drivers side. On the lower t that is where the solenoid hooks up. Now as for the hose from the solenoid to the driver side it as hanging by the battery against the engine dry rotted and wasnt connected to anything. If I had a diagram or knew where exactly the hoses went I would be home free.
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Monday, September 26th, 2011 AT 4:56 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Ok. On one side of the vacuum "T", you have vacuum going to the AC/heater controls and to the front axle. The other side is vacuum supply from the manifold. I have found a couple of other images that may be easier to see.
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Tuesday, September 27th, 2011 AT 2:48 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
"The a/c controls and front axle actuator are vacuum actuated and both use the same vacuum source."
"Check the vacuum hose coming from the engine and the vacuum hoses around the vacuum reservoir, located near the drivers side hood hinge. This is the most common point of failure."

Here's a couple more vacuum diagrams.
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Tuesday, September 27th, 2011 AT 3:01 AM
Tiny
JUSTIN ADAIR
  • MEMBER
  • 42 POSTS
Yeah the diagrams of the hoses and axle above that you have are wrong. We obtained a copy from a dealership that luckily had one. We found the hose that leads to the passanger side and are still looking for the area for the driver side. I believe it goes into a canister like you said but can not locate it.
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Tuesday, September 27th, 2011 AT 5:23 PM
Tiny
RIVERMIKERAT
  • MECHANIC
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There should be a small metal flap, behind which the vacuum reservoir/amplifier is hidden. In the driver side fender.
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Wednesday, September 28th, 2011 AT 3:18 AM
Tiny
JUSTIN ADAIR
  • MEMBER
  • 42 POSTS
Okay I located the connection for the other hose on the driver side. In the last picture I uploaded it is Item 10 and is located behind the box where the brake lines go. It is well hidden on the driver side about the wheel well and in the middle of the fender as described. Now my proble is I am getting a random misfire Code 300. I have changed the plugs, wires, distributor and fuel filter. The vehicle sometimes bogs down when I hit the gas when I first start it (Seldomly while I am stopped at a light or so on). But most of the time it runs normal? Tried LUCAS injector cleaner aswell.
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Thursday, September 29th, 2011 AT 10:35 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
I prefer Techron, but I have 30 years' affiliation with Chevron, so that may explain that. If you have an OBDII scanner that can gather real-time data, clear the code and see what data can be obtained in real-time. You may have a problem with the ignition module or a sensor/pickup somewhere.
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Thursday, September 29th, 2011 AT 11:02 PM

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