When in 2wd I push either 4wd lo or 4wd hi and the light on the buttons just blink even though I can hear and feel 4wd catching but will not turn front axle. Haven't had the 4wd actually working in months. Both fuses are good and have new switch box in the dash. 230,000 miles and never changed fluid in transmission or differentials. no leaks.
For 4wl need to be stopped and put in neutral or park it wont actuate while driving [ blinking light indicates failure to engage ] 4wd hi can do while driving --if fails also then check and test for actuator sticking --control module --or transfer case failure
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 Hi does not work on 96 Chevy K1500 Suburban
we had this same problem, under the car there is a modular,near the transfer case, it just unlugs and plug a new one in.20 min.. it is approx. $80.00 item,$ 350.00 to have it done. we were in yellowstone when we had this problem. hope this helps
SOURCE: 98 Chevy S10 4wd drive will not engage when button is pushed
your problem sounds like either the transfer case control module located where you hear the clicking sound, or the actuator on the transfer case itself.
try unplugging the transfer case control module and then plug it back in, try engaging 4wd again (make sure your in neutral, coasting at 1-2 mph might help as well) if it still doesn't work check the actuator itself to see if the actuator is trying to engage. if the actuator is trying to engage but doesn't, take the actuator out and check it for wear or damage. if the actuator seems fine and it responds to the buttons when pressed i'd go after the transfer case control module as the culprit. ran into that a few times on those s-10's. 3 out of 4 that i've seen were fixed with a new tccm. 1 of the 4 needed an actuator, check your local junk yard for a working tccm or actuator.
hope this helps!
SOURCE: 98 K1500 suburban, can not engage 4wd, HI or Lo runs otherwise
your doing it right but your accuater is bad 59.00 auto zone easy install
SOURCE: chevrolet truck 4wd switch blinks
If they are blinking I believe it means that there are fault codes present in the pcm. You need to get the computer scaned to see if there are an codes present. If you live near an Autozone or Checker autoparts they can scan it for free.
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