Can anyone post pics or diagnostic procedures to check if the vacumn system under the pass side dash is working properly. I understand this also controls the recirc flap/door in the center of the firewall inside the dash.

What is the problem.

Using a hand vacuum pump on each of the vacuum lines at both switch-over valves will show if there is a leak.

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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

Where are these valves located?

PM me with your email address and I'll send you this article I saved on a Word Doc:

"Troubleshooting the Mercedes-Benz 190 Tempmatic ACC Climate Control System"

Dave

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible