When should Fresh-Air/Recirculation Flap open?

[Scalmanini Steve]

Can anyone tell me when the Fresh-Air/Recirculation
Flap should open?  I replaced the broken spring
earlier today (Thankyou Doyt Echelberger and Kneale
Brownson)	 then checked the flap on all CC settings at
max and min temperature, and the flap never opened.
Does anyone know under what conditions it should open?
 I couldn't find it in the Bentley.

TIA,

Steve



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