I'm just so sick of my Blazer now. I can't even stand to look at it. It makes me mad.

I was having the problems described in this thread at one time: 4WD Whining

I changed the vacuum switch on the transfer case, and it fixed it for a while. It started with the same problem again. So I changed out the same switch on the transfer case, and that did nothing to fix it. So I then changed the actuator under the battery, and it has done nothing. The cable that runs from the actuator to the front end moves easily, and seriously doubt it is any cause of the problem.

I don't know where to look next. It is aggrevating me to death.

Is there anyway that I can just disconnect the 4wd system until I get a day to go through absolutely everything? Can I just unhook the vacuum hose going to the actuator? I believe the problem is still vacuum related. Like it has a leak somewhere that I haven't been able to find. I'd just be able to have it rigged so I can still drive it until I can get it fixed, since this is my only vehicle as of right now.

Can someone offer some help? Please?

-Eli
2001 Blazer. 5-speed. 4x4.

 

drop the front drive shaft.

 

I thought about that.

I was thinking tho, the actuator engages the front axle. So, then, just taking out the front driveshaft wouldn't help much with that.

 

Ok I have a friend that works at a Chevy dealer as a shop forman.. and this is HIS answer... : (its a TSB)

Subject: Front Axle Grind Whine Noise in 2WD, Gone in 4WD - keywords
231 233E 236 axle bearing case differential front gear HI2 HI4 loud
moan pinion rough transfer vibration #PIP3183A - (03/16/2006)



Models: 1997-2004 Chevrolet S-10

1997-2005 Chevrolet Blazer

1997-2004 GMC Sonoma

1997-2005 GMC Jimmy

Equipped with 4WD




--------------------------------------------------------------------------------

The following diagnosis might be helpful if the vehicle exhibits the
symptom(s) described in this PI.

Condition/Concern:
97-04 T1 vehicles with a grinding noise/vibration from the front axle
in 2WD only. The noise is not present in 4WD. Front axle side/pinion
gear finish, thrust washer worn, pilot bearing in stub shaft worn,
and/or front suspension trim height incorrect.

Recommendation/Instructions:
Install the Chassis Ears on the front axle assembly or a rubber hose
on the front axle vent tube long enough to reach the cab of the
vehicle. Use the hose to verify that the noise is coming from the
front axle assembly.

If the noise can be isolated to the front axle:

Inspect the front axle housing for possible ground out to chassis,
i.e. mount brackets, housing casting, etc.
If no ground out is detected then confirm that the suspension "Z"
height is correctly adjusted.
If no trouble is found with the procedure outlined above, remove the
differential assembly and replace the following front axle components:

Part name
Illustration # as found in SI Document # 856787

Carrier/case assembly
37

Side/spider gear kit
57,58,59,60,61,62,63,64

Pilot bearing
11

Thrust washer kit includes
8,10,and 24

** Right axle bearing
4


** Inspect and replace only if necessary

Please follow this diagnostic or repair process thoroughly and
complete each step. If the condition exhibited is resolved without
completing every step, the remaining steps do not need to be
performed.



GM bulletins are intended for use by professional technicians, NOT a
"do-it-yourselfer". They are written to inform these technicians of
conditions that may occur on some vehicles, or to provide information
that could assist in the proper service of a vehicle. Properly
trained technicians have the equipment, tools, safety instructions,
and know-how to do a job properly and safely. If a condition is
described, DO NOT assume that the bulletin applies to your vehicle, or
that your vehicle will have that condition. See your GM dealer for
information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


(c) Copyright General Motors Corporation. All Rights Reserved.


--------------------------------------------------------------------------------
Document ID# 1788523
1997 Chevrolet Blazer - 4WD

 

Good gravy, if that's the case I'll just take it to the auction and sale it, let it be some other suckers problem. I don't have the time/money/or patience to goof around with those types of things.

It doesn't do it in 2wd all the time though.

I could drive flat land all day, and just so long as I didn't put a hard load on the engine it wouldn't do it. Even just giving it gas to pass a vehicle isn't enough to make it do it. It has to be something like going up hill, and losing enough speed to have to start gearing down.

Thats why it leads me to believe it is still somehow vaccuum related.

 

sorry hun, thats all i have for this one...

 

I think the t case wants to/is partially engaged. try to remove a fuse to it.

 

Does anyone know when their should be vacuum going to the actuator under the batter?

It has vacuum in 2wd, and no vacuum in 4wd. Is that right or wrong?

 

Anyone have any idea about the vacuum thing?