1991 Mercury Cougar blend door actuator

1991 MERCURY COUGAR
70,000 MILES • V8 • 2WD • AUTOMATIC
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OFFONE
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  • 12 POSTS
Vincent answered my question about Error code E7 on the temp readout. I removed the blend door actuator and checked the motor and mix door. The mix door moves freely and If I use an outside power source the motor works. However, if I connect the blend door actuator to the heater connection, the actuator does not work. I have 4 volt reading on a meter connected to the heater connection that does not change when I activate the controls (heat, vent, defrost). Would the problem be in the blend door actuator or in the dash control module.

Thank you
Norman
Dec 9, 2008 at 3:55 AM
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JNOVACK
  • ✓Experienced Mechanic
  • 723 POSTS
you should have 12 volts at motor it sounds like the controler its not the acuator
Dec 9, 2008 at 9:55 AM
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OFFONE
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Would it be better to find another control unit or trace the problem to the core.

Norman
Dec 9, 2008 at 10:12 AM
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JNOVACK
  • ✓Experienced Mechanic
  • 723 POSTS
first try tracing the wires back from door acuator to the controller to check that there are no breaks in wire and if you don't find any then I would change the controller
Dec 9, 2008 at 11:10 AM
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OFFONE
  • MEMBER
  • 12 POSTS
Thank you, I will start looking for a module now and also check out the wiring.

Norman
Dec 9, 2008 at 12:04 PM
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