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1998 Mercury Sable Heater Flapper door?

Tiny
WRUSSELL4BB6
  • MEMBER
  • 1998 MERCURY SABLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 66,000 MILES
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?
Thursday, November 5th, 2009 AT 11:35 AM

1 Reply

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
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.
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Friday, November 6th, 2009 AT 7:06 PM

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