2000 chevy blazer 4x4 not engaging, however 4x4 light is lit up when pressed.

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! If your Blazer’s 4x4 light is coming on but it’s not engaging, the issue could lie with the transfer case motor or the vacuum actuator system—classic culprits for these trucks. The transfer case motor (or encoder motor) might be stuck or faulty, failing to shift into 4WD even when the button is pressed. Meanwhile, a broken vacuum line or actuator (found under the battery tray) might not be engaging the front axle. It’s like flipping a light switch with a busted bulb—it looks like it’s working, but nothing’s actually happening. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.