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Old 01-06-2010, 01:37 PM
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Default four wheel drive problem

i have a weird problem with mt four wheel drive, i push the button, i hear the click in the right side, so i know the module works and i hear the tranfer case shift(both into hi and lo) but it doesnt engage, some one told me it could be a vacuum switch, but before i change parts i figured i ask you guys...any ideas? thanks in advance
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Old 01-06-2010, 01:42 PM
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Sounds like the vacuum switch is getting stuck. Just remove it and clean it out. The switch is located on your transfer case and you'll see 3 hoses going to it.

Click the image to open in full size.
Btw thanks to Kyle for the above picture. I'm currently using this to clean out my vacuum switch.


And if you are still having problems, then remove your battery tray and check the Vacuum Actuator, they are known to go bad as well.
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Last edited by nj4x4blaze; 01-06-2010 at 01:45 PM.
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Old 01-11-2010, 09:13 PM
 
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My 2004 Blazer was not going into 4 Hi, i traced the vacuum lines and jiggled some wires and now it works. I found the vaccuum line in your diagram, line B, which you have vented to atmosphere. This line is sucking in air, like a working vaccuum in all modes, 2wd, 4 low and 4 hi. That does not seem right and I was wondering if it was normal.
Old 01-11-2010, 09:13 PM
 
 
 
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1994, 2000, actuator, blazer, chevy, drive, engage, guys, k5, located, mechanical, problems, vacuum, wheel, wont


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