goes in 4wd but not out until you cut truck off

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Oct 16, 2013 | 11:54 PM

parks336

Thread Starter

New Member

Joined: Oct 2013

Posts: 9

From: 336 NC

goes in 4wd but not out until you cut truck off

2000 blazer lt goes in 4wd but wont go out until you cut truck off and.back on...what could cause this?

Oct 17, 2013 | 08:28 PM

Captain Hook

Moderator

Joined: Mar 2009

Posts: 8,453

From: Belleville, Michigan

Vacuum lines not connected correctly at the transfer case vacuum switch, or a faulty vacuum switch.

Oct 18, 2013 | 07:36 AM

parks336

Thread Starter

New Member

Joined: Oct 2013

Posts: 9

From: 336 NC

Thank you,i will be checking this.over the weekend..

Oct 18, 2013 | 08:32 AM

bromanjr

Starting Member

Joined: Aug 2011

Posts: 115

From: Howell, MI

Quote:

Originally Posted by parks336

2000 blazer lt goes in 4wd but wont go out until you cut truck off and.back on...what could cause this?

This always happens when the two vacuum lines at the firewall solenoid are hooked up backwards, swap the vacuum hoses and recheck.

Also, There is a vent for the axle actuator built in to one of the ports of the solenoid, if it is hooked up backwards or the vent is plugged, this symptom can happen.