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In Reply to: Re: Full Manual Heat/AC posted by Bob on November 04, 2001 at 20:43:08:
There is no way to do this. You COULD obtain a heater control valve that uses a cable control and insert it into heater hose, running a cable control into the passenger compartment. Then, if you unplug the electric heater valve on the firewall, the manual one will control (since zero volts fully opens the electric valve).
Bob