First of all, this topic belongs in the Maytag Forum, not Frigidaire....JennAir is a Maytag brand. Mr. Capone, would you please see to it?
The plastic strap that connects the damper to the front control wheel has many small holes, but only one elongated hole. This matches an elongated cam on the damper for proper alignment. By not having it on there correctly, your damper may be wide open, causing the cold temps you complained about.
The best way to do any job like this is to first consult the Service Manual before you get all Bob Vila
Here's the JennAir Top Mount Manual
for your model...if all else fails, read the book.