Question about 1998 Chevrolet Blazer
Posted by Anonymous on
It could be a few things the system is vacuum opperated runs off the engine vacuum throgh a switch on the transmission then to whats called an actuator that is located under the battery on this vehicle then goes from there to the front carrair where the vacuum pulls the control level to shift it into 4 wheel . Doyou have a shift lever manual or the electronic shift control . I have the complete factory manual for bolth but the manual shift is far less complex .If you need i will E.MAIL what you need but tell me some more if you can about the problem first mabey it can be quickly idenified and easly corrected with out me haveing to send pages of information that may or may not be relivant to your problem email@example.com
Posted on Apr 03, 2011
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Posted on Jan 02, 2017
SOURCE: 1999 chev blazer 4x4 system
When you say that the 4wd won't engage, I assume you mean that the front differential is not locking in. If memory serves me correct there is a 3 port vacuum switch located on the top of the transfer case that gave a lot of problems. When the transfer case is shifted to a 4wd mode (high or low) this vacuum switch changes position and routes engine vacuum to the actuator located under the battery tray. This actuator then pulls a cable that move a fork inside the front differential that locks the front diff in 4wd. The vac switch gave a lot of trouble, but any broken vac hoses or differential internal mechanical issues could present as the same issue.
Posted on Nov 23, 2008
small sylinoid on the top of the transfer case needs replaced. easy to do. it has three vacumelines going to it just trun out and replace like a bolt.
Posted on Dec 13, 2008
Need more information, but try to engage with engine at idle and transmission in nuetral and then slowly put into gear. Some vehicles will only engage 4wd system in D for Drive not the D with the circle around it for Over Drive, due to speed restrictions on the system. 4H is used for inclement weather and snow for highway use or cruising off road. 4L should only be used OFF road not on pavement and for slow speeds only. If that does not work put in drive and slowly move vehicle forward with 4wd switch engaged shift to nuetral while coasting and then put into a forward gear NOT reverse and it should engage, make sure you do not have locking hubs as well, I don't know many vehicles that have locking hubs as of late, but I could be mistaken. Hope this helps. Other post have also stated that the 4wd switch could be faulty, and can easily burn out.
Posted on Jan 11, 2009
common problem with these is corrosion at electrical connector in control box located on passenger side behind kick panel
Posted on Mar 01, 2009
try putting it in neutral while it's running with foot on the brake then push 4 hi or 4 lo it should switch over then. Had the same problem on my 98 blazer the other day.
Posted on Oct 30, 2009
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