Question about Chevrolet Blazer

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I have a 2000 Chevy Blazer, the 'Service 4WD' light comes on and stays on almost all the time. every once in a while the light will be off once started or turn off while running. When I put it in 4WD, it works just fine and doesn't make any wierd noises or vibrations. IDK...

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  • christinajco May 07, 2010

    Thanks for the many possible scenarios, will check these out.



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Check the connection going to the transfer case and look for any rubbing through on the wire insulation. 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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