Question about 2001 Chevrolet Blazer
So my four wheel drive went out, i had a mechanic replace the push button on the dash, was told that wasnt it and it was the actuating motor. So I replaced it, it does the same thing it did before. It starts in four wheel drive, and if i hit the auto four wheel drive button then the two wheel drive button it tries to but then turns off completely till the car is restarted.. I have no idea what is wrong with it, i'm going to take it to a shop to have the four wheel drive read by one of those computers and see what it says, any ideas though????
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.
Posted on Dec 04, 2008
You can also check the vacuum lines and diaphram that are located underneath the battery shelf. Comes out really easy. Check that the lines are not broken. There is a vacuum line that runs to the solenoid in the center of the fire wall, as previously stated by 'speedfreek' and there is an actuator cable that runs to the transfer case. Sometimes it is as easy as replacing the vacuum hose, or the diaphram under the battery shelf went bad. If you ever had a battery leak acid because it went bad.....that acid goes under the shelf and eats those lines.
Posted on Aug 16, 2008
Make sure that the pine on the selenoid is not bent!!!
Posted on Nov 22, 2008
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Posted on Jan 02, 2017
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