Any simple by-pass will leave you without control. That system can really make some heat if you put it full flow. Being in Atlanta I don't think you will like it.
I remember years ago seeing in A/C catalogs manual heater valves which looked just like the bottom of the MB/Chrysler servo. These I presumed were for Chryslers that didn't have Climate control. Seems like a lot of trouble though. How much real diagnostics have you done on the system. Does the system switch duct positions?
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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician
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