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CHEVROLET 2002 BLAZER ZR2 POPS OUT OF 4 WHEEL DRIVE, MAKES LOUD 'KLUNK'

THIS MODEL HAS PUSH BUTTONS-2WD 4 HI AND 4 LOW. IN 4 WHEEL DRIVE, IT WILL 'POP' OUT OF 4 WHEEL DRIVE, ON A BIND OR PAST 15MPH, MAKES LOUD 'KLUNK'. IN COLDER WEATHER, 4WD MAY NOT ENGAGE EVEN THOUGH YOU CAN HEAR THE ACTUATOR 'CLICK' IN. IS THIS A TRANSFER CASE PROBLEM OR AXLE PROBLEM OR BOTH?

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  • Cars & Trucks Master
  • 2,101 Answers

It is the transfer case problem

Posted on Dec 11, 2012

  • GREG DEWITT Dec 11, 2012

    Thank You. But would this be the electric motor acctuator itself, or (I have read somewhere) a chain inside the transfer case that has too much 'slop'? On this model, I dont believe there are any vacume lines involved in operation.

  • teds repairs
    teds repairs Dec 11, 2012

    i have seen a lot of the electric acctuator go bad

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SOURCE: 2002 ford explorer-no 4 wheel drive

wheel bearing

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SOURCE: my 2000 blazer won,t select 4wd hi/low or auto

there is a vacuum solonoid on the firewall in the middle with 2 vac lines and a 2 wire plug
thats ur problem
push the button and smack it with the handle of a screwdriver should work

Posted on Feb 07, 2009

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SOURCE: Front drive, 4 Wheel drive won't engage

Check the switch on the transfercase remove the vacume lines if there is oil in them the switch has to be replaced and the lines should be cleaned out you should also check under the battery tray to make sure the boot is not ripped that controls the leaver to engage the front axel

Posted on Feb 16, 2009

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SOURCE: 4wd will not engage on 2002 gmc sierra 1500

try going into reverse for 10 feet then go to drive for 10 feet that might help if not it is to the wiring to you 4x4 engage system (wires to your wheel hub)

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SOURCE: My 1999 chevy silverado 1500 four wheel drive

You probably have a bad encoder motor.It is located on the side of the transfer case on the drivers side.It is black.The other problem they had with these was the switch but you have already replaced this so your next thing is the encoder motor.Hope this helps.Good luck.

Posted on Dec 28, 2009

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