# 2001 Chevrolet S-10 Blazer 4WD system issues

**URL:** <https://community.cartalk.com/t/2001-chevrolet-s-10-blazer-4wd-system-issues/113952>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet\
**Created:** [March 18, 2018, 10:13pm UTC](https://community.cartalk.com/t/2001-chevrolet-s-10-blazer-4wd-system-issues/113952 "2018-03-18T22:13:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![zeller](https://avatars.discourse-cdn.com/v4/letter/z/c0e974/32.png) [@zeller](https://community.cartalk.com/u/zeller)\
**Post date:** [March 18, 2018, 10:13pm UTC](https://community.cartalk.com/t/2001-chevrolet-s-10-blazer-4wd-system-issues/113952/1 "2018-03-18T22:13:44Z")

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4x4 dosent work lite flashes 2 wheel then goes to 4x4 but no go help thank u

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**Author:** ![edb1961](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/edb1961/32/122_2.png) [@edb1961](https://community.cartalk.com/u/edb1961)\
**Post date:** [March 19, 2018, 3:24pm UTC](https://community.cartalk.com/t/2001-chevrolet-s-10-blazer-4wd-system-issues/113952/2 "2018-03-19T15:24:55Z")

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This is a good introduction to the 4wd setup on a Blazer.

[http://www.automotiveforums.com/vbulletin/t572914.html](http://www.automotiveforums.com/vbulletin/t572914.html)

Check the vacuum lines at the vacuum switch (on firewall). I had to replace the switch on my 2000 Blazer.

Also resetting the TCCM (Transfer Case Control Module) in the right front kick panel might help. Remove kick panel and disconnect the wiring harness for a few seconds.

Ed B.