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on the front axel
You need to remove the dash assembly to gain access to the blend door actuator. Too many steps to list here. Recommend purchasing a shop manual for that vehicle if you intend on doing that job yourself, it will be worth the investment.
Remove the dash assembly to gain access to the blend door actuator.
The 1997 Chevrolet blazer actuator switch is located on the firewall in the engine compartment. The switch is on the passenger side of the engine compartment.
Could be the vacuum actuator, or it could be an electronic fault, if you have an electronically controlled transfer case or an all wheel drive vehicle.
The Blazer was a decent vehicle which had its quirks. The rear seal on the Chevy small blocks are notorious for needing replacement, as is the intake manifold gasket. Body wise, the actuator arm for the rear glass is prone to breaking, and will need replacement at some point in the vehicle's service life.
Under your battery tray
The blend door actuator can go bad. Big job to replace it. Dash assembly must be removed to gain access to it.
The latch on the actuator is probably broken... it's a very common problem for the Blazer. Pull off the trim on the rear door, and you'll be able to see it (and replace it) for yourself.
The 4x4 actuator is screewed into the front differential housing towards the passanger side, It has electric wires going to it,
Check under vehicle follow the fule line from the tank
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