1. Interior Handle Mechanism:
* Broken Cable: This is the most frequent culprit. The interior handle is connected to the exterior handle via a cable. This cable can stretch, fray, snap, or become disconnected from either the interior or exterior handle mechanism. You'll need to remove the interior door panel to access this.
* Disconnected Cable: Even if the cable is intact, it might have become disconnected at either the interior handle or the exterior latch mechanism. Again, panel removal is necessary.
* Worn or Broken Interior Handle Mechanism: The plastic components inside the interior handle itself can wear out or break, preventing the cable from engaging properly. Replacement of the entire interior handle assembly might be needed.
2. Exterior Handle Mechanism:
* Broken Exterior Handle: The exterior handle might be broken internally, preventing it from actuating the latch mechanism. You can sometimes feel if the handle has play or feels loose, indicating a broken component.
* Jammed Latch Mechanism: Dirt, debris, or corrosion can jam the latch mechanism, making it unresponsive to the exterior handle.
Repair Steps (Requires Removal of Interior Door Panel):
1. Remove the Interior Door Panel: This usually involves removing screws around the panel edges and possibly popping off plastic clips. There are numerous online tutorials specific to 1992 S10 door panel removal—search YouTube for "1992 S10 Blazer/S10 door panel removal" (Blazer panels are very similar). Be careful not to break the clips.
2. Inspect the Cable: Once the panel is off, locate the cable connecting the interior and exterior handles. Check for:
* Broken Cable: If broken, you'll need a replacement cable. You can find these at auto parts stores.
* Disconnected Cable: If disconnected, carefully reconnect it to both the interior and exterior handle mechanisms.
* Cable Tension: If the cable is stretched, you might be able to tighten it slightly, but this is a temporary fix. Replacement is generally recommended.
3. Inspect the Interior Handle Mechanism: Examine the plastic components of the interior handle for breakage or excessive wear. If broken, replace the entire interior handle assembly.
4. Inspect the Exterior Handle and Latch Mechanism: Check for any obvious damage to the exterior handle itself. Lubricate the latch mechanism with a penetrating lubricant like WD-40 (followed by a dry lubricant like graphite to prevent further sticking). This can help free up a jammed mechanism.
Parts:
You'll likely need to purchase replacement parts from an auto parts store (AutoZone, Advance Auto Parts, etc.) or online. Mention the year, make, and model of your S10 to ensure you get the correct parts. You might need:
* Interior door handle assembly: This is often sold as a complete unit.
* Exterior door handle assembly: Only if the exterior handle itself is broken.
* Door handle cable: This is a specific cable for your year and model of S10.
Important Note: If you're not comfortable working on cars, it's best to take your S10 to a mechanic. Improperly repairing the door handle could lead to further damage. The process involves removing several parts and requires some mechanical aptitude. Referencing repair manuals specific to your vehicle year can also be beneficial.
