Question about 1999 Chevrolet Blazer
Triing to find out why it wont go back to 2hi and is it safe to drive in auto4wd mode
If your have not changed one of the differentials it is safe to drive i would check the vacuum lines going to the transmission
Posted on Apr 23, 2013
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Posted on Jan 02, 2017
check the solenoid on the front differential. i had a similar problem. when i would start to engage 4wd low/high and it would blow the fuse. i replaced the front solenoid and fixed my problem.
the solenoid can be found in the right side of the front differential. costs about $100 at local part store and takes 5-10 to changeout with an adjustable wrench.
Posted on Nov 12, 2009
Most common problem is the vacuum diaphragm that is so inconviently mounted UNDER the battery tray.The cable that locks in the front diff is attached to it and vacuum pulls it in/out.
Posted on Dec 23, 2008
Mine is acting up as well, a mechanic friend of mine said it was the four wheel drive actuator, and it was quite common he said
Posted on Jan 22, 2009
Make sure that all 4 tires have the same tread on them, if one or more of them are different, then the 4wd may not engage. I had the same problem with my blazer, I changed only 2 tires at a time. The front tires would rotate faster than the rear ones, the gears in the transfer case won't line up right.
Posted on Apr 29, 2009
Tips for a great answer:
Transfer Case Description and Operation in Transfer Case - NVG 246-NP8
Transfer Case Description and Operation in Transfer Case - NVG 261-NP2
Transfer Case Description and Operation in Transfer Case - NVG 263-NP1
The NVG 246 EAU provides 5 modes, Auto 4WD, 4HI, 4LO, 2HI and Neutral.
The four manual mode, or range gear positions, of the NVG 261 transfer case are:
2HI - 2 wheel drive high range
4HI - 4 wheel drive high range, part-time
4LO - 4 wheel drive low range, 2.72:1 gear ratio reduction
N - Neutral, 4 wheel
The NVG 263 transfer case provides the driver with 4 manual mode/gear positions:
2HI - 2 Wheel Drive high range
4HI - 4 Wheel Drive high range
4LO - 4 Wheel Drive low range
With the info I've given you ,you should be able too now !
There is probably a code stored somewhere !
DTC B0790 DTC B2725 DTC C0300 DTC C0305 DTC C0306 DTC C0321 DTC C0327 DTC C0359 DTC C0374 DTC C0379 DTC C0550.
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