{"id":31957,"date":"2016-06-15T09:59:09","date_gmt":"2016-06-15T14:59:09","guid":{"rendered":"http:\/\/www.freeautomechanic.com\/mechanic\/forum\/?p=31957"},"modified":"2016-06-15T09:59:09","modified_gmt":"2016-06-15T14:59:09","slug":"mode-door-actuator","status":"publish","type":"post","link":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2016\/06\/mode-door-actuator","title":{"rendered":"Mode Door Actuator"},"content":{"rendered":"

\"ModeI have a 2010 jeep liberty and suddenly the heat and A\/C stopped working by the control dials and settings. It just blows hot air constantly through defroster<\/p>\n

\n

RESPONSE<\/p>\n

What you have described is a faulty mode door actuator.<\/p>\n

The heating and Air Conditioning<\/a> system uses a reversible, 12-volt direct current (DC) servo motor which mechanically positions the mode<\/span>-air door<\/span>. The mode<\/span> door<\/span> actuator (1) is located on the driver side of the HVAC housing.<\/p>\n

The mode<\/span> door<\/span> actuator is interchangeable with the actuators for the blend-air door<\/span> and the recirculation-air door<\/span>. Each actuator is contained within a black molded plastic housing. Each with an integral wire connector receptacle (2) and integral mounting tabs (3). This allows the actuator to be secured to the HVAC housing. The mode<\/span> door<\/span> actuator output shaft (4) is connected to the linkage that drives the mode<\/span>-air door<\/span>. The mode<\/span> door<\/span> actuator does not require mechanical indexing to the mode<\/span>-air doors, as it is electronically calibrated by the A\/C-heater control.<\/p>\n

How the Mode Door Actuator Works<\/h2>\n

The mode<\/span> door<\/span> actuator is connected to the A\/C-heater control. It is connected through the vehicle electrical system by a dedicated two-wire lead and connector of the HVAC wire harness. The floor, defrost and the panel-air doors can be moved in two different directions by the mode door actuator. When the A\/C-heater control pulls the voltage on one side of the motor connection high and the other connection low, the mode<\/span>-air doors will move in one direction. When the A\/C-heater control reverses the polarity of the voltage to the motor, the mode<\/span>-air doors moves in the opposite direction. Furthermore when the A\/C-heater control makes the voltage to both connections high or both connections low, the mode<\/span>-air doors stop and will not move.<\/p>\n

The A\/C-heater control uses a pulse-count positioning system. This is to monitor the operation and relative position of the mode<\/span> door<\/span> actuator and the mode<\/span>-air doors. The A\/C-heater control learns the mode<\/span>-air doors stop position during the actuator calibration procedure. And will store a diagnostic trouble code<\/a> (DTC) for any problems it detects in the mode<\/span> door<\/span> actuator circuits.<\/p>\n

The mode<\/span> door<\/span> actuator cannot be adjusted or repaired. It must be replaced if inoperative or damaged because of its design.<\/p>\n","protected":false},"excerpt":{"rendered":"

I have a 2010 jeep liberty and suddenly the heat and A\/C stopped working by the control dials and settings. It just blows hot air constantly through defroster RESPONSE What you have described is a faulty mode door actuator. The heating and Air Conditioning system uses a reversible, 12-volt direct current (DC) servo motor which… Read More »Mode Door Actuator<\/span><\/a><\/p>\n","protected":false},"author":12817,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[1,34],"tags":[7272],"class_list":["post-31957","post","type-post","status-publish","format-standard","hentry","category-auto-repair-questions","category-jeep","tag-liberty"],"yoast_head":"\nMode Door Actuator - FreeAutoMechanic Advice<\/title>\n<meta name=\"description\" content=\"The mode door actuator is interchangeable with the actuators for the blend-air door and the recirculation-air door. 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