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First check these steps in engaging.
Stop completely, clutch in or neutral for automatics, step on brake pedal, engage 4wd, select gear. Sometimes the engage switch is connect to the brake also. I have to step onthe brake to get into 4Low on my 1993 Explorer.
Next step is to check for loose wires under the transmission. If the plug came out the trans wont know to get into 4wd.
Lastly, if you are handy, get a chiltons or othr manual and remove and clean the 4wd module.
If none of these work then the module is probably burned out, replace or take to a shop for replacement.
Hope this helps you get it fixed.
it is more likely you droped somthing on it or hit it
the only other thing i could see to crack a rad is ice but of course you have made it a habit of checking the rad has 50/50 mix in it all the time even if you live in california
as stupid as it sounds have some one or you tap the solinoid on transfter case when the button is pressed. I have to do this to make it work for a little bit longer
What is the vehicle doing when you try to engage the 4x4?
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