1990 S-10 4x4 not engaging

I know you've answered this question many times for the newer blazers but mine is a 1990 and doesn't have the electrical buttons to shift to 4x4. My fluid level is fine but it won't go into 4 high... What can I do?

I know you've answered this question many times for the newer blazers but mine is a 1990 and doesn't have the electrical buttons to shift to 4x4. My fluid level is fine but it won't go into 4 high... What can I do?

Will it go into 4L and or 4H when in neutral?

It doesn't go into 4L or 4H at any time. Not in nuetral either.

It doesn't go into 4L or 4H at any time. Not in nuetral either.
i'd start by checking the vacume actuator under the battery,
i just replaced mine today, the transfer case shifted ,but the front wheels didn't enguage. also take a look at the vacume lines going from the servo to the transmission then the switch then the encoder motor.good luck
my bet is on the actuator, make sure it holds a vacume.

I have an 89 , so I know what you are talking about . Can you move the shifter rod , but the light does not glow ? My bulb was blown . My vacuum line was cracked. My actuater was loose under the battery . My switch was wrong on the transfer case . Many things could be off . give me more info please . Rob