Thank you Kyle, 4×4 problem – FIXED

I have a 2002 Blazer 4×4 with Auto 4X4. I had last used the Auto 4×4  successfully was on December 26 when we experienced icy conditions returning from visiting relatives in Northern California. I tried the 4×4 a few weeks ago and found that it didn’t work, just flashing lights in all but 2×4, but the transfer case motor operated and seemed to change the gearing. I searched and found this forum and immediately started educating myself, as the Chilton’s Manual I have is only good for a paperweight. Today I have been looking over the 4×4 system on the truck, locating components and etc. as pointed out by Kyle’s responses to other member’s problems. I finally found the vacuum control valve which is neatly hidden behind the wiring harness and some other connectors. Lo and behold – a vacuum hose right at the valve! I cut the hose, reattached it and now I have a functioning 4×4 system So, this is a huge thank you to Kyle and this forum for telling me what to look for and where to look for it! – Ted

3 thoughts on “Thank you Kyle, 4×4 problem – FIXED”

  1. I have a 99 blazer. Got the cable and motor but 4 low will not engage properly. Some times it will go in flawlessly. Normally first start. Normaly it makes a clanging sound and kicks back into 2wd. Sometimes when it does go in it will get stuck. It will go from 2wd to 4 hi perfectly. Any help would be greatly appreciated.

  2. Remove the switch from the dash and resolder the circuit board. Over time, they get a cold solder joint and loose connection. Hope this helps.

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