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94 S10 BLAZER NO 4WD


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DCDSHADE
Novice

Dec 6, 2007, 8:16 PM

Post #1 of 4 (2887 views)
94 S10 BLAZER NO 4WD Sign In

THE 4WD WILL NOT ENGAGE. IT IS A NP233 TRANFER CASE. THE AUTOMATIC TRANSMISSION IS WORKING FINE. THE 4WD HI AND LOW LIGHTS DO NOT COME ON WHEN THE SWITCH IS PUSHED. THE SWITCH IS GOOD AND I GET 5 VOLTS TO THE TRANFER CASE ON 4 OF THE SEVEN WIRES. WHERE ELSE SHOULD I LOOK?


Guest
Anonymous Poster

Jan 7, 2008, 1:38 PM

Post #2 of 4 (2859 views)
Re: 94 S10 BLAZER NO 4WD Sign In

your problem is located under the batteery
there is a vacum actuted pump that locks the front axel in. coasts about 50 bucks and is an easy fix


DCDSHADE
Novice

Jan 8, 2008, 4:15 PM

Post #3 of 4 (2850 views)
Re: 94 S10 BLAZER NO 4WD Sign In

THANKS. I THOUGHT THAT MIGHT BE A PROBLEM BUT I CAN HEAR THE PUMP ACTIVATE WHEN I WAS ABLE TO GET THE TRANSFER CASE INTO 4WD. I WAS PLAYING WITH THE BUTTON AND THE TRANSMISSION SHIFTER TO GET IT INTO 4WD. I HAD SOMEONE LOOK AT IT AND THEY BELIEVE THE SERVO ACTUATOR MOTOR IS NOT WORKING. I BEEN SICK WITH THE FLU AND I AM GETTING READY TO TACKLE THIS PROBLEM AGAIN.


way2old
Veteran / Moderator
way2old profile image

Jan 8, 2008, 4:48 PM

Post #4 of 4 (2848 views)
Re: 94 S10 BLAZER NO 4WD Sign In

There is also a vacuum switch on the side of the transmission. All it is is a ball that moves one way with vacuum and falls back without vacuum. These will hang up and cause no engagemnet. Cheap part too.



Being way2old is why I need help from younger minds






 
 
 






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