98 sebring convertible dash vent wont open

[kendq]

my 98 sebring convertible dash vent wont open, I pulled most of the dash around it including the vent tube when I go from heat to vent it sometimes moves a touch but only about a quarter of the way I can push it the rest.
any ideas?

[kendq]

it was the vent motor calibration had to unhook the batt for 15 min when you rehook it will go to def then vent to cal itself