On the last Blazer I had the vacuum setup and it went bonkers on me in the middle of a snow storm... the fix was to spray the lines with liquid electrical tape.......
On my 88 S10 Blazer had the Vacuum system mess up during a storm so I ran a line direct to the Vacuum Diaphragm and never fixed it because I did a permanent install of the hose and when the 4WD didn't work I just swapped the hose! This truck has the Electronic 4WD with the Auto Option. Has worked everytime flawlessly but has to go bonkers today~! If the 4WD crapped out I will just pull the Electric Motor and manually engage it so Full Time 4WD until the snow is gone. But since No Service 4WD Light not and electrical problem.
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