Shop manual is not clear on the removal procedure for the evaporator core--any hints are welcomed. I removed the bolts holding the casing for the evaporator core and I am trying to remove the evaporator casing from the heater casing, but it appears that the entire unit (heater and air conditioning plastic casing house) must be removed as a unit from under the dash. Is this correct? Temperature in Scottsdale is reaching 100 degrees F and climbing. [Non-text portions of this message have been removed]