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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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23,854 Posts
The only real way to diagnose the ATC is with a scan tool (DRB III or equivilent). These have a solid state blower control module instead of a resistor to vary fan speed.
Have you tried resetting the module logic with a battery disconnect/reconnect?
 
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