heater FORD SIERRA 1990 2.G Wiring Diagrams Workshop Manual
Page 18 of 47
Wiring diagrams  13•43
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Diagram 3. Ancillary circuits - horn, heater blower, heated mirrors and screens.
Models from 1987 to May 1989 
Page 34 of 47
Wiring diagrams  13•59
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Diagram 3. Ancillary circuits - horn, heater blower, heated mirrors and screens. Models from 1990 onwards