2000 blazer 4 wheel drive problem

Make sure that the vacuum hose connector is connected AND connected correctly at the transfer case and at the front differential. If that is all right and the front differential still doesn't engage, then you need to test the vacuum actuator at the front differential.

Ihave the manuals for up to 99 but i don't think chevy changed the system ot 2000 . The unit is vacuum opperated and when the drive gear inside the transaxle is engaged the wheels will spin there is no locking hub involved in the system witch means the problem is coming from behind that system . Ineed to read somethings in the manual but the games are coming on so i will get back to you later to day with an answer And what else dose it or dosen't do reguard the 4 wheel what dose the shift indicator light indiacte and are you getting any codes there is a lot of wireing to do with the transfer case and how it interacts with the transmission

Have your transfer case looked at. There is an electronic switch on it which could have gone bad which casues it to not work. Otherwise if your isnt electronic look on top of the case to where it shifts and make sure there isnt an ice build up causeing it to not engage. You could also have a bad hub in the wheel that is causing it to not engage

You will see the motor move when you engage the switch on the dash. The motor is on the bottom of the transfer case behind the transmission. Most likely it's the actuator for the hub lockouts under the battery tray. They wear out after a few years. It could also be the cable that locks the hubs that goes from the actuator to the hub lock in the front differential. Also, check your front differential oil level, if it's not getting oil it won't disengage. Check to make sure the hoses between the transfer case and the actuator are not leaking. If that isn't the case there is a air activated switch ont he top of the transfer case where the air hoses plug into, it has three hoses that go to it. That switch screws in but you have to lower the transmission cross member to get to it. It could also be bad, it costs about twelve dollars. Good luck.

I have the same problem with mine, I also had the same problem with a ford explorer, they told me it was the transfer case which has to do with the hubs. it jumps into 4 wheel drive then when you hit 2 wheel it stops.. Always had a problem with this in both of my SUV's.

The light comes on indicating that the transfer case is engaged in 4wd, but that doesn't mean the hubs are locked. If you have automatic locking hubs, you should check to make sure they are working correctly. This GM vehicle may be equipped with vacuum locking hubs... meaning there is a vacuum line running from the transfer case selector to the hubs on each side. The vacuum makes the hubs lock into place. If those vacuum lines are damaged or missing, they wont lock. If you have electronic locking hubs, they may need to be replaced. Good luck.

Sounds like one of your hubs is sticking and not engaging. You can check them by engaging the hubs and the transfer case and jacking up each front wheel independently if it doesn't spin your good, if it does you found your problem. As far as fixing a hub goes, it may be just dry and need some grease, or there are some very good aftermarket hubs available from Warn.
Hope this helps

i'm assuming you have a 4 wheel drive. If that is the case then yes cause when your in two wheel drive mode the front is in neutral

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.

I have a 1999 chevy blazer that stuck in 4 wheel drive. How do you get it out.