The solenoid can be removed to verify movement is unobstructed. I believe the connections are the real culprit. Bypassing the switch and existing wiring is a simple way to test the existing setup. The solenoid can be checked out of circuit too. The load on the solenoid will be needed to see if action is weak. Verify your properties before testing. Take picks if the ole memory might be not as good as it used to be... just sayin... All my best!
SOURCE: My 98 chevy blazer won't shift into 4wd.
Most common problem is the vacuum diaphragm that is so inconviently mounted UNDER the battery tray.The cable that locks in the front diff is attached to it and vacuum pulls it in/out.
SOURCE: 4wd light says service
Does the 4-wheel drive work ? Most of the time, it is a reminder to have your fluid changed. Other times, it could be a vacuum leak in the line that engages the 4-wheel drive. Check both of those first.
SOURCE: differentail fluid replacement frequency
Al ot of it depends on the type of driving you do. If you are driving primarily on paved roads, in town or highway driving, you can go 50K or more before replacing. If the differential is a limited slip, I would recommend no longer than 50K because of the clutch pack conditioners breaking down in the oil.
If you are an off road user, I would change the oil anytime the differential was under water or in mud and if you are driving primarily on dust dirt roads dirt roads, change it every 25 to 30K.
If you tow a trailer, keep the changes for both limited slip and conventional differentials to the 30K range.
You will keep the components happy and failure free. Just remember that water and dirt are the enemy.
Good luck, hope this answers your question and is only my opinion.
If you want specific manufacturers recommendations, you can find them in your owners manual.
Regards,
SOURCE: 99 s-10 blazer, the service 4wd light is one and
did you try completely stopping the vehicle, puttin the shifter in neutral, and putting it in and taking it out of 4-wheel drive?
Shifty_Tazz
SOURCE: I have a 2003 chevy blazer LS, 2-door 4wd w/
try putting in nuetral and then shift into high gear . if still does not work sounds like the 4x4 acctuator is bad
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