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the 87 190e does'nt have monovalve it has vacuum operated heater valve that is fed vacuum from the electric distribution block hidden behind dash on the right of glove box.the defult for the valve[no vacuum] is open.now if you follow the line and make sure that there are no breaks it could be the distribution block or the push buttons that send electric commands.it could also be diaphram on the valve.if that is good you can run vacuum from a good source and turn valve to off.
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