My 4wd light keeps blinking off and on and wont keep a steady light, I dont think that it is working the manual that came with the blazer says that the gears need to be adjusted, plus on my dash the troubleshoot light says service 4wd, how can I adjust my gears myself?
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.
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check the fuses supplying the front viscous-coupling system solenoids, there should be at least one fuse for this marked AWD or 4WD. Also the locking hubs or the front differential may be damaged from engaging 4x4 while moving.
If it is an auto then the fuse or box fluid levels are likely areas to check.
If the fuse is found to be intact, check the relays click when 4x4 is selected, and replace the necessary relay if it does not operate.
You will need the service manual for your car to locate and identify the correct electrical equipment for the 4x4 function.
You may contact a GM dealer for assitance in getting a manual for that year and model.
I would also recommend getting a good repair manual for that vehicle. The savings for one repair will more than offset the price of the repair book. I use manuals produced by Haynes which can be found in most auto supply stores like Advanced Automotive or Auto Zone.