My 1992 Chevy S10 Blazer with a push button engage 4-wheel drive won't shift into 4 high I can get it into 4 low Anyone have an idea of what may be wrong?

most of those even though they are push button 4 wheel drive, they still work off of a vaccum. you need to have a local auto mechanic to take a look under the front end where the vaccum lines attach to the transfer case and see if they are unplugged or if there is a defected one.