Tim -

It sounds to my like the clutch in the air pump is on it's way out. Look under Engine, Intake & Exhaust Manifolds on the CD. Suggest unplugging the electrical connector and seeing if that stops the noise.

Jeff -

You are looking at the cruise control unit. I am unsure what would cause it to click.

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe