View Single Post
Old 01-08-2003, 06:51 PM
mbdoc mbdoc is offline
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The reason you might hear a change when the brake pedal is depressed is, the feed-back pot is mounted on the blend air flap that is VACUUM controlled. If the vacuum is reduced then the FLAP will move changing the position of the potentiometer.

BTW the feed-back potiontiometer is at the top of the heater box & the COMPLETE dash must be removed for replacement.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote