* Broken or jammed latch: The motor might be working, but the actual latch mechanism itself might be broken or jammed. Something could be physically preventing the latch from releasing, even though the motor is trying to actuate it. This is the most likely culprit.
* Worn-out linkage: The motor drives a linkage that connects it to the latch. Over time, this linkage can become worn, bent, or broken, preventing the latch from opening even if the motor is functioning.
* Wiring or connector issue: Although less likely if you hear the motor, there's a possibility of a loose connection or broken wire somewhere in the circuit between the switch and the motor. Check for any frayed wires near the motor or the tailgate latch itself.
* Low voltage: A weak battery could cause the motor to struggle and not have enough power to fully release the latch.
Troubleshooting Steps:
1. Manual Check: First, try to manually open the tailgate. Is there any resistance? Can you feel anything binding or broken? This will give you a good indication if the problem is mechanical or electrical.
2. Inspect the Linkage: Carefully examine the linkage connecting the motor to the latch. Look for anything that's bent, broken, or disconnected. You might need a flashlight and possibly even remove some interior panels to get a good view.
3. Check the Latch Mechanism: Try to access the latch mechanism itself (this may require some panel removal). Look for any obstructions or signs of damage.
4. Listen Closely to the Motor: Does the motor sound weak or strained? A healthy motor should make a consistent and relatively strong sound. A weak sound might indicate a failing motor or low voltage.
5. Check the Fuse: There's a fuse associated with the tailgate release. Check your owner's manual to locate the appropriate fuse and check if it's blown.
6. Check the Wiring/Connector: Visually inspect the wiring harness and connector near the motor and the latch. Look for any signs of damage, corrosion, or loose connections.
If you're not comfortable working on car mechanisms yourself, it's best to take your Blazer to a qualified mechanic. Trying to force the latch open could cause further damage.
