Just open the monovelve and check the rubber seals. Most of the time the top seal is damaged and coolent flow thru heating coil. The voltage indicates that signal to close the monovelve is sent from a/c controler.
Roman
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87 300 SDL 155K
86 420 SEL 225K
86 300 SDL 211K
83 300D 226K
81 300D 139K
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