How to Replace the Blend Door Actuator Yourself Sometimes they are placed above or below the heater box, also known as the HVAC box. The actuator is usually screwed in with an electrical connector on the corresponding driver or passenger side. Temperature blend door actuator located on the driver side, above the accelerator pedal and on the side of the HVAC box Commands may work intermittently or not at all, making it difficult to control the temperature settings. Sometimes the head unit or heat and A/C controls cause the A/C to blow hot or cold air on one side. If the temp sensor isn’t working and the vehicle has a hard time picking up accurate information, this can affect the way the temperature settings work. More on how the blend door and blend door actuator can cause the heat to blow cold air Temperature Sensor Not Working The evaporator core, for example, will need the refrigerant to be removed by a professional before it can be safely disconnected. Parts like the heater core and AC evaporator core will need to be disconnected. ![]() To replace the blend door, steps like removing parts of the interior, like the dash, are common, and it can be time consuming to access and remove the heater box to replace this part. If the knob is loose and can be pulled in and out or twists too freely, like 360 degrees, there is likely an issue with the blend door. The knob should shift and stop, and you may hear the blend door open and close as you turn the knob. You can tell if there’s a problem with the blend door once the blend door actuator, which controls the blend door, is removed. Knob on the heater box that controls the blend door Sometimes the blend door can jamb or stick, or have issues being controlled and cause problems with airflow like the ac blowing hot on one side and not the other or the heat to not work. This is how hot air enters the cabin, and when the heat is turned on, air will flow from the heater core. When you turn the heat or AC on, the blend door inside of the heater box will direct airflow from the blower motor. The heater box is located below the dash and houses parts like the blower motor, heater core, and evap core. Sometimes the temperature will blow hotter or colder on one side from mechanical problems with the vent door or blend door inside of the heater box. A faulty blend door actuator can be identified with an advanced scan tool and sometimes makes a clicking noise from the dash due to worn or broken internal parts. A blend door actuator is faulty if the HVAC control module commands it to a certain position but it fails to comply, leading to situations like the temp blowing hotter or colder than its intended setting. The blend door actuator, also known as the temperature blend door actuator or vent mode door actuator, can break or malfunction over time. Temperature Settings Adjusted Differently for the Passenger and Driver Side Problems with the HVAC control module can be further diagnosed with an advanced scan tool, but here are some common reasons why the AC might be blowing hot and cold air on either side despite the set temperature settings. Why the AC Blows Cold on One Side and Hot on the Other If you experience the symptom of the AC blowing hot or cold air on one side but not the other and it’s accompanied by a clicking or ticking sound from the dashboard, it probably means a gear in the temperature blend door actuator is faulty and the actuator needs to be replaced. AC Blows Hot or Cold Air on One Side with Clicking Sound If the air conditioning in your car is blowing hot air on one side and cold air on the other, there could be a simple fix like adjusting the temperature or it could be time to replace a part like the temperature blend door actuator. There are a few different reasons why the AC might not work in your car. Signs of a Temperature Problem in Your Car AC Blows Cold Air One Side and Hot Air on the Other
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