Re: [MBZ] Clicking noises from behind glovebox

[Peter Frederick]

Check the condition of the interior temp sampler motor -- having a bad 
motor or loose hose will cause temperature mode switching (you are 
hearing the solenoid for the mode switch).

A shot of contact cleaner on the rheostat for the temp control won't 
hurt, either -- did both on the TE and the problem went away while I 
was replacing the evaporator.

Peter