Question about 1994 Chevrolet S-10 Blazer

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Something is wrong with the 4WD. Will engage in neutral to 4WD Lo which means the vaccum is probably working but 4WD Hi will not engage. I have tried resetting the control module as described in the owners manual. The switch used to shift works fine. i am thinking it is the accuator, the transfer case motor or the module itself. let me know anything if you can.

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What you are most likely feeling is in 4lo the transfer case drops the gear ratio and 4hi just locks the front differential in. do you know if the front axle is locking in in 4lo? i suspect you have a vacuum issue to the front actuator and this is why. there is a vacuum switch on top of transfer case that will stick and cause problems and sometimes the vacuum lines will pop off of this switch.check and see if you are getting vacuum to the actuator if not follow lines be sure one is not broken if you are then actuator is bad

Posted on Dec 30, 2010

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