2000 GMC C3500 Door Lock Cylinder

You should raise the window completely and remove the front door trim panel, the water deflector, the outside door handle, the clip retaining the lock cylinder lever to the lock cylinder, and finally press the lock cylinder retainer and remove the lock cylinder from the outside door handle.

You should press the lock cylinder in the outside door handle to engage the lock cylinder retainer, install the clip retaining the lock cylinder lever to the lock cylinder, and install the outside door handle, the front door water deflector, and the front door trim panel.

You should raise the window completely, remove the front door trim panel, the water deflector, the outside door handle, and the clip retaining the lock cylinder lever to the lock cylinder, press the lock cylinder retainer and remove the lock cylinder from the outside door handle.

You should press the lock cylinder on the outside door handle. Then you should install the clip, the outside door handle, the front door water deflector, and the front door trim panel.

While carefully avoiding damage to the painted surfaces, you should apply heat to the cylinder with a heat gun. Using a paper clip or a similar item, you should hold the door shutter open, and force air into the cylinders. While holding the shutter door open, you should inject small amounts of a recommended lubricant into the cylinder, work the key into the cylinder repeatedly and wipe away any excess lubrication from the key.