GMC

GMC troubleshooting questions? Ask a mechanic for answers

Ask an Expert,
Get an Answer ASAP!

2003 s10 4x4. three lines come out of the vacuum switch but…

Customer Question
Hi. 2003 s10 4x4. three...
Hi. 2003 s10 4x4. three lines come out of the vacuum switch but one has a "T" and one hose that T's off is not connected to anything. I pulled the hose off the Vacuum actuator and blew in it and air comes out of this hose that is just bobbed off and open. Is it suppose to be connected to something some place? My symptoms are the 4x4 wont engage because the vacuum actuator does not get enough pressure to pull the cable activating the diff. It gets some but not enough to pull the link.
Submitted: 2 years ago.Category: GMC
Show More
Show Less
Ask Your Own GMC Question
Answered in 7 minutes by:
1/18/2016
GMC Mechanic: Virtual Wrench, Master Mechanic replied 2 years ago
Virtual Wrench
Virtual Wrench, Master Mechanic
Category: GMC
Satisfied Customers: 14,620
Experience: Over 35 years experience on GMC vehicles.
Verified

Hello,

If you look at the diagram below it shows where that hose goes to. If i understand you it goes to a vent but not sure.

Click here

My goal is that you are 100% happy with my answer(s). I strive for a positive rating. It's the only way i get credit. If you have further questions PLEASE just reply and i will work with you as long as possible.

Ask Your Own GMC Question
Customer reply replied 2 years ago
I have the diagram. That is no help. What I learned, of all places is, that the T is where the transfer case vent and the main line vent come together. I tracked the vacuum back to the source, replaces all the lines, the vacuum switch on the trans, the vacuum actuator and the diff is not locking in even with the cable pulled tight. Is there a solenoid down in the diff that is related to the cable pull from the actuator? I'm convinced at this point it's not a vacuum problem. It's something in the diff. Any suggestions??
GMC Mechanic: Virtual Wrench, Master Mechanic replied 2 years ago

Hi,

There is a fork inside the axle housing that is related to the cable pull. It's what engages the axle. These break all the time. You are going to have to get in there to inspect it and i highly suspect that it is the fault.

LJ

Ask Your Own GMC Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a gmc mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Virtual Wrench Your Own Question
Virtual Wrench
Virtual Wrench
Virtual Wrench, Master Mechanic
Category: GMC
Satisfied Customers: 14,620
14,620 Satisfied Customers
Experience: Over 35 years experience on GMC vehicles.

Virtual Wrench is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

1,796 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,588 satisfied customers

GCM master tech over 25 years

Dave Nova

Dave Nova

GMC Technician

929 satisfied customers

ASE Master Certification. GM World Class Certification

Chris (aka-Moose)

Chris (aka-Moose)

GMC Technician

626 satisfied customers

16 years of experience

Ron Z.

Ron Z.

- GMC Tech -

279 satisfied customers

18+yrs experience. State Inspector & GMC Diagnostics/Repair

JFN1

JFN1

ASE Certified Technician

270 satisfied customers

GM Master Technician

George H.

George H.

ASE MasterTechnician

228 satisfied customers

15+ Years ASE Master Technician with Level 1 Certification

< Previous | Next >

Related GMC Questions
2008 gmc sierra 1500 4x4 5.3l with automatic 4x4 and
2008 gmc sierra 1500 4x4 5.3l with automatic 4x4 and electronic front diff locker. Replaced bad front differential, and tested 4x4. Shifted fine into 4x4 high, fine into 4x4 low, but now vehicle won't… read more
tim37857
tim37857
Mechanic
High School or GED
71 satisfied customers
I have a 97 sierra 4x4 that blows hot air when your driving
I have a 97 sierra 4x4 that blows hot air when your driving but not when idling. This happens when ac is turned off. Would the blend door actuator cause this … read more
tim37857
tim37857
Mechanic
High School or GED
71 satisfied customers
I am swaping an 2004 LS motor,trans,and t-case into my 1994
Hi,I am swaping an 2004 LS motor,trans,and t-case into my 1994 gmc 1500 4x4 how do I connect my old front diff actuator and wires up to newer wiring harness?… read more
GM Bob
GM Bob
Automobile Technician
High School or GED
1,058 satisfied customers
I cant get the 4wd working, 95 blazer, I have changed the
I have changed the actuator, and when i press it, i found a loose vacuum hose that i dont know if it should be attached to something or not .. … read more
Vladgmru
Vladgmru
Automotive Electrician
Vocational, Technical or Trade Scho
1,586 satisfied customers
08 Acadia. Runs fine until you stop at stoplight. When
08 Acadia. Runs fine until you stop at stoplight. When stopped at light, the engine runs roughly, and it says stabilitrak is off.… read more
GM Bob
GM Bob
Automobile Technician
High School or GED
1,058 satisfied customers
GMC Sierra 1500 Classic SLT: , I have a 2004 GMC Sierra 1500
Hi, I have a 2004 GMC Sierra 1500 SLT, extended cab, 2wd, 5.3L. It has the digital thermostat controls. The knob that controls the driver side temperature "slips." When you rotate it an either directi… read more
George H.
George H.
ASE MasterTechnician
Associate Degree
228 satisfied customers
GMC 3500 4x4: I hope you can help. I have a 2002 gmc 3500 4x4
I hope you can help. I have a 2002 gmc 3500 4x4 with the diesel. When I try and engage the front axcel with the push buttons, the lights will show the action, multiple clicking and then the light goes… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
GMC Yukon 4x4: I have a 1994 gmc 4x4 and the front axles wont
I have a 1994 gmc 4x4 and the front axles wont engage transfere case seems to be engaging but 4x4 will not work any ideas?… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
the 4x4 engages and spins the front tires on the hoist, but
the 4x4 engages and spins the front tires on the hoist, but the front pops out if on the ground and pressure is applied to the system upon putting it in gear and trying to move the suburban. I have al… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
GM gmc: I have a 92 gmc 4x4 pick up it wont engage 4x4 I pulled
I have a 92 gmc 4x4 pick up it wont engage 4x4 I pulled the front diff actuator and put it in 4wd and the actuator didn't move so I bought a new one and hooked it up and it still wont move… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
GMC: 2000 chevy s10 no air comes out of heater goes to defrost
2000 chevy s10 no air comes out of heater goes to defrost other outlets work fine it was real cold down to zero this winter turned on the heater herd a loud thump then only came out of defroster ac wo… read more
BigBob
BigBob
Service Manager
High School or GED
2,846 satisfied customers
GMC Yukon XL 1500: I have a 2003 Yukon XL, 83,000mi. The 4WD
I have a 2003 Yukon XL, 83,000mi. The 4WD doesn't engage. Normal is the 2WD light is on, when I push 4WD high the light changes to 4 Hi but the front end does not engage. There is no Service 4WD in th… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
GMC Jimmy 4x4 (Mid Size): I have a 2000 GMC jimmy, my 4x4 doesnt
I have a 2000 GMC jimmy, my 4x4 doesn't work. When it's up on a hoist it engages inXXXXXwhen it's off the hoist it doesn't engage in XXXXX I've replaced the switch in the car, the computer, the encode… read more
Dave Nova
Dave Nova
GMC Technician
Associate Degree
929 satisfied customers
I have a 1994 Chevy S10 Blazer with a 4.3 Vortec V6 andand
I have a 1994 Chevy S10 Blazer with a 4.3 Vortec V6 and*****and had to replace the vacuum control valve. The vacuum tree with the built in control valve by the dash board fire wall above the distribut… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Gmc Sierra 1500: I have a 2004 gmc Sierra 1500. My four wheel
I have a 2004 gmc Sierra 1500. My four wheel drive is not ingadging. I took out the actuator and tested it seems to be working fine. I even put a new one in to see if it had more spring tension. Nothi… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
gmc jimmy: 97 gmc jimmy: 4wd will not engauge. ichanged the
97 gmc jimmy: 4wd will not engauge. ichanged the vacume actuatior 2 weeks ago worked fine. now it dosent transcase still engauging front drive line, any way to tighten cable goin to front diff, or did… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
GMC K1500 4x4: I pulled the engine for a rebuild and is now
I pulled the engine for a rebuild and is now back in. A/C worked b4 the engine was pulled, does not work now. Also, A/C/heater control unit in dash does not move air flow from dash to face to floor. B… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
GMC K1500 4x4: How does the transfer case system work in my
How does the transfer case system work in my 1991 K1500 Pickup? I am not getting an indication light next to the floor shifter... although I suspect a burned out bulb... I am always more interested in… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,588 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x