Looking for a GM code scanner.

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TURNA

Rocket Powered Basset Hound
Jul 24, 2009
10,941
19,990
113
Socialist NY
Is there a vacuum switch in that 4x4 unit?

If there is,

there is water in the vacuum hose that is freezing when it is cold not allowing the vacuum to engage the unit

It was a very common problem on the Blazers
 

Wageslave

Royal Smart Person
Jan 25, 2017
1,747
3,335
113
Is there a vacuum switch in that 4x4 unit?

If there is,

there is water in the vacuum hose that is freezing when it is cold not allowing the vacuum to engage the unit

It was a very common problem on the Blazers

Also, those hoses break down over time and can collapse on themselves under vacuum. That or just completely dissolve in half. My blazer has that issue and EVERYTHING needs replaced.
 

Tomeal

G-Body Guru
Apr 17, 2016
913
1,619
93
Clyde,pa
Vacuum actuated 4 wheel drive..... Reminds me of my old furd truck.

Lots of parts replaced that time!
 
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