1998 Mercury Sable Heater Flapper door?

1998 MERCURY SABLE
66,000 MILES • 6 CYL • FWD • AUTOMATIC
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WRUSSELL4BB6
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Basically the heat works but the door isn't opening to let the heat through into the airstream of the fan motor. Where is this door located and is there a way to open it manually and leave it open?
Nov 5, 2009 at 11:35 AM
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BMRFIXIT
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lets make sure its the blend door and not the heater core in need to be flushed
do a self diagnose test on the system and let me know what you have for codes if any

ENTERING SELF-DIAGNOSTICS
Ensure in-car temperature is 40-90°F (4-32°C) as false in-car temperature sensor DTCs will be displayed. Simultaneously depress OFF and FLOOR buttons, then press AUTO button within 2 seconds. The display will show a dashed line in center of display window for up to 30 seconds while test is running. Record all DTCs as displayed.

Self-diagnostics can be initiated at any time with the resulting DTCs being displayed. Normal system operation is stopped when system is in self-diagnostic mode.
Nov 6, 2009 at 7:06 PM