Question about Chevrolet Blazer
Check the connection going
to the transfer case and look for any rubbing through on the wire
Check to make sure the vacuum line is attached properly with no cracks.
there is a few things to check the switch could be bad. vacuum actuator at the front axle could be bad.The vacuum actuator is located under the battery. You need to remove the battery and the tray to get to it. You will then have to start the truck (difficult with out the battery in, I know), engage 4wd, and check for vacuum and proper motion of the actuator.
If there is no vacuum to the actuator, then you either have a problem with the vacuum switch in the transfer case, the vacuum source on the engine (does your HVAC system work normally?), or you may have a deeper problem that I can talk to, if necessary, once you have done the initial diagnosis.
If you have vacuum, but the actuator just doesn't move. The next step would be to attach a vacuum gauge/pump to the actuator to see if it will hold a vacuum. If it doesn't, then the actuator is shot. If it does and sufficient vacuum does not cause the cable to be pulled, the cable is froze up. To fix a frozen cable, spray with penetrating oil and try to move it either by hand, or with a pair of pliers.
Hope help; tell ue news.
Posted on May 06, 2010
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Posted on Jan 02, 2017
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