I just found mercedesshop.com, nice job.

Now the problem, the passenger rear headrest will not go down?

Now the big problem, when I run the ac or heat, there's a loud ticking/knocking noise under the hood. The noise quits when I turn off ac or heat. The heat works fine, but the ac only works when the car is moving.

I've searched the site, any sugguestions?

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Brian
1999 CLK430