Not only would the dash needs to be removed. The evaporator would be required to be removed as well, meaning you are dealing with A/C freon recovery and recharging of system.
Our database do have information for removing the heater unit, inside which the various doors are located but you should try checking under dash at the linkages on passenger side.
Images (click to enlarge)
Thursday, September 8th, 2011 AT 1:57 PM