There is a switch on both drivers side door and passenger door, it is going to be by the door latch you will have to remove the door cover so you can get to it. easy fix would be to spray down with wd-40 or you can by the part for about 15.00 dlls.
starter motor need overhaul
spray WD40 in the door latch mechanism, it will sometimes get stuck and the lubricant will free it up to engage when the door is closed.
When you park your vehicle.
First you put the vehicle on Neutral then swithc to 4LO it will engage. If a wheel doesn't engage, then you have a vaccum line problem. See owners manual.
it stands for automatic 4 wheel drive, the What_does_a4wd_mean_on_a_gmc_envoydrive will engage when the vehicle senses tire slippage.Good to use when driving on somewhat snow covered roads where some driving might be on the pavement some on snow. Not good to use the 4wd when on pavement especially when turning.
the four wheel drive is opperated by vacuum that's probably where your problem is
I don't think so... I think the transmission need electric power to engage.
There should be a dial next to the temperature controls that say... 2wd/awd/4l/4h
Bang depending on the vehicle, you will ruin the transmission.
check the vacuum diaphragm for leaks. Might be a hole in the vacuum line.
If they are vacuum operated then it could be the hubs.
By grasping the transfer case lever and pulling it towards the rear of the vehicle at any speed below 45 mph. To engage low range: Stop, put vehicle in neutral or park, pull lever back to 4wd High position, push down on lever and pull all the way to back, pull up on lever to engage position.