Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 4×4 not engaging Chevy Blazer 2001 › 4×4 not engaging Chevy Blazer 2001 March 8, 2012 at 11:00 am #439924 dreamer2355Participant That hose may be the drain for the issue (at a guess) but like posted above, just follow the hose to its destination C8-)