* Door Hinge Problems: This is the most likely culprit. The hinges themselves might be worn, bent, or loose. Over time, the bushings within the hinges can wear down, causing the door to sag. Check the hinges for any visible damage, looseness, or play. Tightening the hinge bolts might temporarily solve the issue if they're loose, but worn hinges will likely require replacement.
* Striker Plate Misalignment: The striker plate (the metal piece on the doorjamb that the door latch engages) might be bent, loose, or misaligned. If it's not perfectly aligned with the door latch, the door won't close flush. Inspect it for damage and ensure it's securely fastened. You might need to adjust its position slightly.
* Door Latch Mechanism: The door latch itself could be malfunctioning. Internal parts might be worn or broken, preventing the latch from engaging properly. This is less likely if the door *mostly* closes, but it's a possibility.
* Door Regulator (if power windows): If you have power windows, a problem with the door regulator could indirectly affect the door's alignment. A faulty regulator could put stress on the door, causing it to bind or sag.
* Body Damage: Less likely but possible, there could be underlying damage to the door frame or body itself, such as a previous collision that wasn't fully repaired. This could be subtle and hard to spot.
Troubleshooting Steps:
1. Visual Inspection: Carefully examine the door hinges, striker plate, and door latch for any signs of damage, looseness, or misalignment.
2. Check Hinge Bolts: Tighten all hinge bolts. Use a wrench or socket to ensure they're snug. If they're stripped, you'll need to replace the bolts (and potentially the hinges themselves).
3. Inspect Striker Plate: Make sure the striker plate is firmly attached and properly aligned with the door latch. You may need to adjust its position slightly using a screwdriver.
4. Check Door Latch: Try operating the door latch mechanism manually (if possible) to see if there's any binding or resistance.
5. Test Door Alignment: Try closing the door while gently applying pressure at different points to see if you can identify where the binding is occurring.
If you're not comfortable working on your car yourself:
Take your Chevy Blazer to a qualified mechanic. They have the tools and expertise to diagnose the problem accurately and perform the necessary repairs. It's much better to have a professional handle this to avoid further damage or injury.
