W201 chassis uses a vacuum heater valve. Vacuum shuts the valve OFF. It is under the plastic air intake grill under the hood, on the passenger side of w/s wiper mech. Disconnect vacuum line from valve w/warm engine to see if valve still works.
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MERCEDES Benz Master Guild Technician (6 TIMES)
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44 years foreign automotive repair
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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