four wheel drive problem - Blazer Forum - Chevy Blazer Forums

Steering, Suspension & Drivetrain Questions about your steering, suspension, axles, and/or transfer case? Post up here.

Closed Thread
Thread Tools Search this Thread
Old 01-06-2010, 01:37 PM
New Member
Thread Starter
Join Date: Jan 2010
Posts: 7
petethepig24 is on a distinguished road
Default four wheel drive problem

i have a weird problem with mt four wheel drive, i push the button, i hear the click in the right side, so i know the module works and i hear the tranfer case shift(both into hi and lo) but it doesnt engage, some one told me it could be a vacuum switch, but before i change parts i figured i ask you guys...any ideas? thanks in advance
Old 01-06-2010, 01:42 PM
nj4x4blaze's Avatar
Blazer Forum 2009 Ride of the Year Winner
Join Date: Aug 2005
Location: North Jersey
Posts: 3,068
nj4x4blaze has a spectacular aura aboutnj4x4blaze has a spectacular aura about

Sounds like the vacuum switch is getting stuck. Just remove it and clean it out. The switch is located on your transfer case and you'll see 3 hoses going to it.

Btw thanks to Kyle for the above picture. I'm currently using this to clean out my vacuum switch.

And if you are still having problems, then remove your battery tray and check the Vacuum Actuator, they are known to go bad as well.

Last edited by nj4x4blaze; 01-06-2010 at 01:45 PM.
Old 01-11-2010, 09:13 PM
Join Date: Jan 2010
Posts: 1
ssfligg is on a distinguished road

My 2004 Blazer was not going into 4 Hi, i traced the vacuum lines and jiggled some wires and now it works. I found the vaccuum line in your diagram, line B, which you have vented to atmosphere. This line is sucking in air, like a working vaccuum in all modes, 2wd, 4 low and 4 hi. That does not seem right and I was wondering if it was normal.
Closed Thread

Related Topics
Thread Thread Starter Forum Replies Last Post
four wheel drive problem gml New Member Area 4 01-04-2013 12:02 AM
Four wheel drive wiring problem gmoney30 Full Size K5 Tech 5 01-19-2010 11:49 PM
high four wheel drive problem chevy98 Steering, Suspension & Drivetrain 11 04-02-2009 03:41 PM
four wheel drive hub's not locking in myronhntr80 1st Gen S-series (1983-1994) Tech 10 12-07-2006 03:06 AM
four wheel drive not engaging?'86 s-10 missu General Tech Help 1 03-15-2006 02:36 AM

1994, 2000, actuator, blazer, chevy, drive, engage, guys, k5, located, mechanical, problems, vacuum, wheel, wont

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Featured Sponsors
Vendor Directory

All times are GMT -5. The time now is 10:46 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.