Join Date: Mar 2003
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Re: 1999 Blazer Pushbutton 4x4 problems
The first thing would be to narrow down where the problem is.
With the wheels blocked, engine running, truck in 2wd mode, reach underneath and turn the front driveshaft. It should turn freely. Push the 4wd hi button and turn the driveshaft again. If it still turns free then the problem is with the transfer case. If it is locked then jack up one front wheel. If the wheel turns free but the driveshaft is still not turning then the front axle is not engaging and it is probably the vacuum actuator beneath the battery tray.