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Username Post: 2000 Blazer will not go into 4x4 hi        (Topic#363833)
Posts: 2

Reg: 05-19-18
01-02-21 07:50 AM - Post#2811177    

Hi there,
Our 2000 Blazer, when switching from 2 wheel drive into 4 wheel high and then going into 2 wheel drive will not shift back into 4 wheel high again. It will, however, go into 4 wheel low after stopping, putting the emergency brake on and shifting into neutral.

The module has been changed three times and they all do the same thing, not work, so we are back to the original one again. The motor on the transfer case has been replaced, vacuum lines have been checked, and the panel switch has been replaced.

When this happens the only cure for it, at present, is to disconnect the battery and then it will work one time by going into 4 wheel high.

In my area we just had 10.5 inches of snow within a 24 hour period.

Any suggestions would be appreciated.


Member #271 Senior Chevytalk Moderator
Posts: 25367
Loc: Austin, TX 78748
Reg: 05-09-00
01-04-21 04:19 AM - Post#2811304    
    In response to Blazerwgrandkids

Welcome to the site.
Replaced the hoses. Even if they look good. Old hoses cause all kinds of problems. I had a similar problem with a friend's Ram 4X4. I know I hooked up everything correctly. It didn't want to work. Knowing the parts were old, I used zip ties at the connections. Sure enough vacuum loss prevented engagement. Zip tie vacuum hose connections. Next, get a cheap hand held vacuum from Harbor Freight. Pull light vacuum to activate the switch and test the servo. Check grounds.
The final suggestion, ditch the electrical 4X4 and go mechanical. and other vendors have conversion kits.

Let me look at my '96 factory service manuals. I'll look for troubleshooting procedures.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE

Edited by gchemist on 01-04-21 08:08 AM. Reason for edit: No reason given.

Posts: 78

Reg: 10-01-13
01-24-21 11:13 PM - Post#2812863    
    In response to Blazerwgrandkids

When you attempt to shift, check the solenoid also if it is working properly.


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