Until the split systems and later model CAN cars, the outside temp display had no relationship to the output ait temp. One the later cars useing CAN for information swap the AAC control unit (n73 i think) uses the outside ambient temp, sunsensor input and in the case of the 203 sunangle input to determine output temps. That neat little ball sticking out of the cowl is the sun posistion sensor on the 203, 220's use a similar system. 210's got the sunsenso and I think they got the ambient input via CAN from IC in 2000 or 2001.

Joe

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Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.
Raleigh NC
919-881-0364