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The heater control unit on my 1978SC had been modified by some PO. I bought another one (when they were cheap) and have since made one that works after a fashion by combining parts from each of them. Basically, the central control knob is now just a switch for the engine compartment fan but at least I can get some heat. I have also disconnected the rod that opens/closes the gates and use the manual lever to open and shut the gates. So you don't need the sensors; when you get too hot just turn the heat off manually.
Roy
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1959 Bristol 406 (bought in 1972; sold in 1977)
1966 Porsche 2.0 coupe (bought in 1977; sold 1981)
1978 Porsche SC coupe (bought in 1993)
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