89 S10 Blazer 4WD not working
SizzleMP
well. However when I got stuck in some mud recently I noticed the 4WD was not
working. The front wheels don't engage.
After getting back on the road I tried even 4LO, and while the truck engages in
the lower gears, the front wheels still will not engage. No indicator light
lights up on the 4WD shifter. I have no idea where to start looking.
Does anyone know what the problem might be? Is there something I can test, a
fuse? A vacuum line? Thanks in advance.
James J Brslik
to be a defective electrical module on the transfer case that engages the front
differential.
Jim
CHRIS WHIDDON
A KNOWN PROBLEM
Any User
>I have an 89 S-10 Blazer with 173,000 miles on it. It's been maintained very
>well. However when I got stuck in some mud recently I noticed the 4WD was not
>working. The front wheels don't engage.
>After getting back on the road I tried even 4LO, and while the truck engages in
>the lower gears, the front wheels still will not engage. No indicator light
>lights up on the 4WD shifter.
My '91 had a similar problem once. It was a defective vacuum switch
located on the transfer case. I had to make a field repair and used
some WD40 to clean out the switch. Worked fine for a couple of days
until I replaced it when I got home.
Before I determined it to be the switch, I checked the vacuum diaphram
that engages the front axle and the hoses connecting everything.
SizzleMP
>A KNOWN PROBLEM
>
What does a vacuum blatter look like?
When you say left side , I am assuming the driver's side?
Drew Blouch
on the transfercase, and most likely replace it, its cheap and easy to do.
That switches the vacuum lines to the bladder up front in the engine
compartment. Then check the bladder (mine was on the passenger side), it
should suck in when you put it in 4 wheel, this engages the front
differential. The bladder sucks in and pulls a wire which engages the front
differential. This wire could be broken, mine was proken off in the pumpkin
and I had to take apart the front front pumpking to fix it. Not that bad of
a job. That is as far as I've had it apart, but I'll try to help otherwise
if I can.
Drew
"SizzleMP" <sizz...@aol.com> wrote in message
news:20010612073308...@ng-fr1.aol.com...
Big Daddy
wrote:
>Same problem on my 87 except I was stuck in snow!! Check the vacuum switch
>on the transfercase, and most likely replace it, its cheap and easy to do.
>That switches the vacuum lines to the bladder up front in the engine
>compartment. Then check the bladder (mine was on the passenger side), it
>should suck in when you put it in 4 wheel, this engages the front
>differential. The bladder sucks in and pulls a wire which engages the front
>differential. This wire could be broken, mine was proken off in the pumpkin
>and I had to take apart the front front pumpking to fix it. Not that bad of
>a job. That is as far as I've had it apart, but I'll try to help otherwise
>if I can.
If anyone needs a new vacuum switch for the front axle, I've got a
bunch I'll sell at $12 each, including postage. These are brand new
switchs that have never been on a vehicle.
Wally Crow
aka Big Daddy
'74 Sporty chop
ASE Master Auto Tech.
Chevy Master Tech Y2K
TOMKAT SENS BS#133
Big Daddy
wrote:
>Same problem on my 87 except I was stuck in snow!! Check the vacuum switch
>on the transfercase, and most likely replace it, its cheap and easy to do.
>That switches the vacuum lines to the bladder up front in the engine
>compartment. Then check the bladder (mine was on the passenger side), it
>should suck in when you put it in 4 wheel, this engages the front
>differential. The bladder sucks in and pulls a wire which engages the front
>differential. This wire could be broken, mine was proken off in the pumpkin
>and I had to take apart the front front pumpking to fix it. Not that bad of
>a job. That is as far as I've had it apart, but I'll try to help otherwise
>if I can.
If anyone needs a new vacuum switch for the front axle, I've got a
bunch I'll sell at $12 each, including postage. These are brand new
switchs that have never been on a vehicle.
Wally Crow
aka Big Daddy
'74 Sporty chop
ASE Master Auto Tech.
Chevy Master Tech Y2K
TOMKAT SENS BS#133
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Drew Blouch
on the transfercase, and most likely replace it, its cheap and easy to do.
That switches the vacuum lines to the bladder up front in the engine
compartment. Then check the bladder (mine was on the passenger side), it
should suck in when you put it in 4 wheel, this engages the front
differential. The bladder sucks in and pulls a wire which engages the front
differential. This wire could be broken, mine was proken off in the pumpkin
and I had to take apart the front front pumpking to fix it. Not that bad of
a job. That is as far as I've had it apart, but I'll try to help otherwise
if I can.
Drew
"SizzleMP" <sizz...@aol.com> wrote in message
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Mike
~~~~~~~~~~~~~~~~~~~~~~
Wally Crow
>Can anybody supply a GM factory part # for this switch please??
No, I don't have the part # but I do have about 15 of the vacuum
switchs(brand new, never used) floating around my shop. Send me
$12.00, I'll send you one.
Old Crow
'74 Sporty chop
ASE Master Auto Tech; Chevy Master Tech Y2K
TOMKAT SENS BS#133 DOF#51