[klavant]

I just bought an 06 and have a question about the drivers door. There are 2 main hinges, upper and lower, which are steel. There is also a plastic one in the middle. The middle one is making a knocking noise when the door is opened and closed. Is this a hinge and what is it's purpose? I'm thinking that it's loose and needs to be replaced before it gets worse.

 

[SuperMat64]

I think that the plastic one your talking about is not really a plastic one... it is the stopper and the spring that permit to keep the door open.

The sound you hear is that spring... Try to lubrificate it and see if the sound stop... if not you'll have to replace it.