My AAC valve behaves the same way as yours, doesn't seem to be a problem for cold idle. Actually, I never really get a fast idle - but it seems to idle ok at about 900 rpm on a cold start whatever the weather. When it's really cold, it sometimes creeps up to about 1100. I did get the AAC to open further by popping it in the freezer: I guess fully open is for Scandinavian-style cold starts!
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