Looking for a GM code scanner.

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TURNA

TURNA

Rocket Powered Basset Hound
Jul 24, 2009
10,040
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

Wageslave

G-Body Guru
Jan 25, 2017
984
93
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

Tomeal

Master Mechanic
Apr 17, 2016
265
63
Clyde,pa
Vacuum actuated 4 wheel drive..... Reminds me of my old furd truck.

Lots of parts replaced that time!
 
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