Question about 1999 Chevrolet Blazer

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BLAZER 4X4 HI LITES UP BUT THEN GOES BACK TO 2WD, 4WDHI WORKS

HOW DO YOU FIT THIS PROBLEM IN A 1999 CHEVY BLAZER

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  • bennett766 Jan 08, 2009

    THE 2WD WORKS AND THE LITE STAYS ON WHEN YOU TRY TO SHIFT IT TO 4WD HI THE IT LITES UP BLINKS FOR 2-3 SECONDS THEN GOES RIGHT BACK TO 2WD

  • bennett766 Jan 09, 2009

    YES IT IS AUTO 4WD AND IT DOES WORK IN 4LOW ALSO I HERE A CLICKING SOUND COMING FROM THE MODULE ON THE PASSENGER SIDE PANEL WHEN I TRY TO PUT IT IN 4WD. BUT THERE IS NO SOUND OF THE TRANSFER CASE ENGAGEING WHEN YOU PUT IT IN 4WD HI BUT THE TRANSFER CASE DOES ENGAGE IN 4WD LOW.

  • bennett766 Jan 14, 2009

    I THANK YOU FOR YOUR HELP BUT I DISCONNECTED THE COURTISY LAMP FUSE AND THEN DISCONNECTED THE ATC FUSE UNDER THE HOOD WAITED FOR 2 MINUTES THEN REPLACED THEM THEN TURNED THE KEY FIVE TIMES ON AND OFF. STARTED THE VEHICLE AND THE FOUR WHEEL DRIVE NOW WORKS. I FOUND THE SOLUTION TO THIS ON YOUR WEB SITE. A LITTLE SEARCHING PAYS OFF. THANKS TO YOUR WEB SITE IT COST ME JUST A LITTLE OF MY TIME.

  • mikehumble May 11, 2010

    Who provided the solution that you found?

  • mikehumble May 11, 2010

    The question was do you have AUTO 4WD? The other question was have you tried 4LOW? If you have not tried 4LOW, try it and tell me what happens. Without this info I can not help you.

  • mikehumble May 11, 2010

    Do you have auto 4WD? Also have you tried 4LO if not try then let me know.

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My 4by4 doesn't engage,both lights 4hi and 4low blink for few seconds and then goes back to 2wd and that's it, won't engage 4wd...what should I do?

Posted on Jan 17, 2009

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I had the same exact problem with my blazer, what you described seems like some of the symptoms of your 4 wheel drive eventually not working. soo here's my best shot
2 common problems that cause this are the vacuum switch on the transfer case and the vacuum actuator mounted under the battery tray. When the switch on the transfer case goes bad it pulls fluid out of the transfer case and pumps it into the actuator and destroys it. The switch only costs about $15 and are usually stocked at major auto parts stores. The actuator ranges from about $50 to $120 and most of the time need to be ordered. If you reach under the battery tray with the 4wd engaged and follow the cable you will feel the end of the actuator, make sure that it is pulling back. If not either the switch or actuator or both are bad. Hope this helps.

Posted on Jan 11, 2009

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