The vents on this car are vacuum operated. The push button sends signal to electro/mechanical switch-over valve and that allows vacuum to pull center vent open. How much time to you have to test, & equiptment to check the vacuum system.
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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)
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