UNABLE TO SWITCH VENT FROM FLOOR TO WINDOWS ECT. AT COLD OUTDOO TEMPS ALLSO WISSLE SOUND THAT WILL GO AWAY AT WARMER TEMPS
Jan 25, 2009 at 8:14 PM
2005 Ford F150
2005 FORD F-150
PEBBRAD
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DAVE H
- ✓ASE Certified Mechanic
- 13,384 POSTS
Mode Door Actuators
Electric mode door actuators are used to position the 3 airflow mode doors. The 3 (early build) or 2 (late build) mode door actuators each contain a reversible electric motor to position the airflow mode door. A potentiometer is installed in the floor/defrost door and panel door actuators (early build) or defrost/panel/floor actuator (late build) to allow the EMTC module to monitor the position of the airflow mode doors. The potentiometer circuit consists of a 5-volt reference signal connected to one end of a variable resistor, and a signal ground connected to the other. A signal return circuit is connected to a wiper which is driven along the variable resistor by the actuator shaft. The signal returned to the EMTC module from the wiper indicates the position of the airflow mode door. The air inlet mode door actuator is driven to the full RECIRC or full FRESH air inlet position, and does not require a potentiometer circuit to monitor it's position.
Electric mode door actuators are used to position the 3 airflow mode doors. The 3 (early build) or 2 (late build) mode door actuators each contain a reversible electric motor to position the airflow mode door. A potentiometer is installed in the floor/defrost door and panel door actuators (early build) or defrost/panel/floor actuator (late build) to allow the EMTC module to monitor the position of the airflow mode doors. The potentiometer circuit consists of a 5-volt reference signal connected to one end of a variable resistor, and a signal ground connected to the other. A signal return circuit is connected to a wiper which is driven along the variable resistor by the actuator shaft. The signal returned to the EMTC module from the wiper indicates the position of the airflow mode door. The air inlet mode door actuator is driven to the full RECIRC or full FRESH air inlet position, and does not require a potentiometer circuit to monitor it's position.
Jan 25, 2009 at 8:17 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.