Question about 2000 Chevrolet Blazer

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2000 chev blazer lt 4wd 4button dash switch service 4wd warning light is on when i try to put it in to 4wd button blinks it tries to engage but doesnt then 2wd button lights back up what is wrong?

Wont shift out of 2wd when i push 4wd button you can hear transfer case trying to engage but light on dash blinks and goes back to 2wd what might prob be?

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  • 495 Answers

Check the vacuum switch under the hood in the center of the firewall...follow vac diag

Posted on May 08, 2014

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Posted on Jan 02, 2017

  • 4 Answers

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

  • 90 Answers

SOURCE: My 98 chevy blazer won't shift into 4wd.

Most common problem is the vacuum diaphragm that is so inconviently mounted UNDER the battery tray.The cable that locks in the front diff is attached to it and vacuum pulls it in/out.

Posted on Dec 23, 2008

  • 1608 Answers

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

  • 2 Answers

SOURCE: 4wd not engaging

These trucks are famous for the transfer case control module failing
and causing problems like you are experiencing. The module is
usually located in the passenger foot well kick panel. You should
be able to find it easy since that is what is making the clicking noise
when you try to go into 4x4. When you find it-unplug the 2 connectors
and looks for green corrosion on the terminals in the plug and also on
the module. They are famous for water intrusion thru the heater system. If you find corrosion, terminals in the connectors will need to
be replaced as well as a new module(they are expensive).

Posted on Dec 14, 2008

  • 35 Answers

SOURCE: chevrolet truck 4wd switch blinks

If they are blinking I believe it means that there are fault codes present in the pcm. You need to get the computer scaned to see if there are an codes present. If you live near an Autozone or Checker autoparts they can scan it for free.

Posted on Jun 21, 2009

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Hi i have a 2000 Chev Blazer, the service 4WD light appears now and then , we never use 4WD so was not worried about it until today i tryed to put into 4WD and it would not work the lights on the buttons...


one of my vehicles is actually a 2000 blazer and i had that same problem believe it or not. you should check all the connections to the brain of the 4wd. take off the passenger side right side kick panel. the kick pannel is that piece on the side right there next to the door. take that off and you will see a grey box. pull the wires out and look at the ends. i cleaned mine out with a q tip because there was crud in one of them which screws things up. if that doesnt fix it you may need a new one. they can be really expensive from a dealer so i went to a wrecking yard and pulled one out of another blazer and it only cost $20. it works fine now :) i hope that helps.

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1992 chev blazer tahoe lt.. 4 wheel drive worked last year. Tried to engage it this year for first time and would not go into 4Lo or 4Hi. Was in neutral. Start vehicle and green light on 4wheel option...


not a fuse if you have power to switch,if your 4wheel light does come on and is not blinking,check the little motor on the transfer case,tap it while someone tries the switch,it might just be stuck from not being use,if it doesn't free its self you may need to replace it.

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2 Answers

2001 Chevy 4wd won't go into 4wd.


there is a module on transfer case above front drive shaft this module is bad but there are two styles so you will need the part number off of yours

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2000 Gmc Sierra. 4wd wont engage, buttons on dash just blink


I had the same prob with my 2000 GMC Sierra 4x4 z71. They replaced the 4wd module in the dash and everything worked after that. Was about $200. The part itself was about $150.

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2000 chevy s10 blazer


first the flashing light means that it is trying to go into 4wd. as far as i know there is no adjustment. The shift motor may be bad, If the transfer case is shifting it could be the silinod in the front differantal.

Dec 16, 2008 | 2000 Chevrolet Blazer

1 Answer

4wd not engaging


These trucks are famous for the transfer case control module failing
and causing problems like you are experiencing. The module is
usually located in the passenger foot well kick panel. You should
be able to find it easy since that is what is making the clicking noise
when you try to go into 4x4. When you find it-unplug the 2 connectors
and looks for green corrosion on the terminals in the plug and also on
the module. They are famous for water intrusion thru the heater system. If you find corrosion, terminals in the connectors will need to
be replaced as well as a new module(they are expensive).

Dec 14, 2008 | 2000 Chevrolet Blazer

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