Now the 4 wheel stopped working

IHATELOVEMYBLAZER

MEMBER
1996 CHEVROLET BLAZER
6 CYL
4WD
AUTOMATIC
160,000 MILES

Ok this thing has a new encoder, vacuum on transfercase, tccm and now the 4 wheel stopped working. It is push button, and everything is working like it should, driveshaft spinning to the front diff, but no spinning of wheels! Vacuum actuator on front diff or worse>? Please help me.

3 Replies

2CARPRO JACK

MECHANIC
11,533 POSTS

I share your feeling.I have one too. Sounds like the vacuum actuator, have replaced more than one of them. Be sure it is getting good vacuum signal to lock the front diff. If so then the actuator is most likely bad. You should be able to manually move the diaphram and hear the front ry to engage, of course not while it is running.

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Friday, May 14th, 2021 AT 12:30 PM

IHATELOVEMYBLAZER

MEMBER
2 POSTS

Where the heck is the thing and how do I replace it? Do you have a vacuum schematic or a picture or directions? Please help too much snow with kids in the car. Thanks a bunch

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Friday, May 14th, 2021 AT 12:30 PM

2CARPRO JACK

MECHANIC
11,533 POSTS

Pretty sure it is under the battery. Follow the cable that hooks to the front axle, it will lead you to it. Be sure it has good vacuum before you replace it, may be a vacuum problem

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Friday, May 14th, 2021 AT 12:30 PM