Re: 1998 chevy blazer won't go in to four wheel drive
It sounds like the encoder motor. That's the black plastic box on the driver's side of the transfer case. But just to make sure, the control module for the encoder motor is located behind the passenger side kick plate (inside the vehicle, passenger side, where your feet would be, outside side). Disconnect it for a few seconds and then reconnect it. If the problem still exists, you will have to repair or change your encoder motor. I grabbed one at a scrap yard for less than $100.00.
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Four wheel High is what you need to use in snow. It is similar to your regular driving experience but your speeds should
not exceed 45-50 mph. Shift through your normal gears as necessary and
drive with appropriate caution. Four wheel High should be used only as long as
driving conditions warrant, using it otherwise can cause unnecessary
wear on your transmission and drive-train as well as lower fuel economy.
Four wheel low is used for pulling out of a ditch if you are stuck, going through deep mud or rock crawling. Four wheel low will also cause your vehicle to lurch every time you press the gas pedal.
Your blazer is equipped with a shift on the fly four wheel drive. That means that at speeds less than fifteen miles per hour you can shift into or out of four wheel drive by simply pushing the four wheel high button. If you wish to shift into four wheel low. Stop, put the transmission into park or neutral, and push the four wheel low button. Same procedure for shifting back out. Never shift into or out of four wheel low while moving. And be careful in four wheel low. At full throttle your still barely moving, you don't want to blow your engine up!
The four wheel drive systems in these vehicles are simple. The push button controls the four wheel drive computer. The computer tells the encoder motor (on transfer case) to shift. When the transfer case shifts there is a vaccum switch on the transfer that is activated which sends vaccum to the accuator under the battery. The accuator pulls a cable to lock the front axle in. This covers all s series trucks and suv's with push button four wheel drive but not with auto or all wheel. Now to answer some questions. If your push button is lit up but will not go in to four high you should try to reset the four wheel drive computer. To reset pull the courtesy light and atc fuses for sixty seconds install fuses then cycle key on and off 5 times. If your transfer case shifts but your front end does not lock in check for vaccum at the switch on the transfer case in and out. If no vaccum out replace switch motormite number 49315 at parts store. If you have vaccum out check accuator.