Here's a troubleshooting guide, starting with the simplest solutions:
1. Check the Obvious:
* Obstructions: Is anything blocking the window's path? Check for debris (leaves, paper, etc.) in the window track. Carefully remove any obstructions.
* Window Regulator: Manually try to lift the window. If it offers *some* resistance but doesn't move freely, the regulator may be jammed or the motor is weak. This is the most likely culprit.
2. Investigate the Window Regulator:
The window regulator is the mechanism that moves the window up and down. It's usually located inside the door panel. This will require some disassembly:
* Remove the Door Panel: This involves removing screws, clips, and potentially disconnecting some electrical connectors (take photos as you go!). Search online for "1999 Chevy Venture door panel removal" for specific instructions and diagrams—this process varies slightly between trim levels. Be careful not to damage any of the wiring harnesses or clips.
* Inspect the Regulator: Once the panel is off, you'll see the window regulator. Look for:
* Broken Cables: The most common failure point. The cables that connect the motor to the window may be frayed, broken, or slipped off their pulleys.
* Broken Parts: Inspect the plastic parts of the regulator for cracks or breakage.
* Seized Mechanism: The regulator itself might be jammed with dirt or rust. Try to manually move the window up and down to see if it's binding.
* Repair or Replace:
* Repair: If the cables are simply disconnected, reattach them. If they're frayed, you *might* be able to repair them with cable clamps or soldering (depending on the material and damage extent), but replacement is usually more reliable.
* Replace: If parts are broken or the regulator is severely damaged, you'll need to replace the entire window regulator. These are relatively inexpensive and readily available online (e.g., Amazon, eBay, auto parts stores) or at your local auto parts store. Make sure you get one specifically for a 1999 Chevy Venture.
3. Check the Window Motor (Less Likely):
The motor itself is less likely to be the problem, but if the regulator appears fine, you can test the motor:
* Check the Motor's Power: With the door panel removed, use a multimeter to check if the motor is receiving power when you try to operate the window switch. If not, you might have a problem with the wiring, switch, or a fuse.
* Test the Motor Directly (Advanced): You can try applying power directly to the motor (be very careful!), but this isn't recommended unless you have electrical experience. Incorrectly wiring the motor can damage it.
4. Fuse Check:
Check your vehicle's fuse box (usually under the hood or under the dash) for a blown fuse related to the power windows. Consult your owner's manual to identify the correct fuse.
Important Notes:
* Safety First: Always disconnect the negative battery terminal before working on the electrical system.
* Take Pictures: Take photos as you disassemble the door panel to help you remember how to put it back together.
* Professional Help: If you're not comfortable working on your car's electrical system or you can't identify the problem, it's best to take it to a qualified mechanic.
By systematically checking these points, you should be able to diagnose and fix your stuck-down window. Remember that online resources, like repair manuals or YouTube videos specific to a 1999 Chevy Venture, can be invaluable during the process.
