How To Replace A Blend Door Actuator

Do you hear the ticking from the dash when the ignition is on? Does your car heater blow cold or your air conditioner blows hot? These are signs that a mixing door actuator has failed. With a little help from our team of ASE certified mechanics and about half an hour of your time, you can replace this part and get your climate control system back up and running. Or you can see how much you pay when you bring your car in for repair.

What’s wrong?

The mixer door actuator is made up of an electric motor that rotates a set of plastic gears in one direction or another that is connected to the air-driven door shaft at the unit’s final drive. An actuator can fail in two ways; first, the electric motor can burn out making the unit unresponsive so nothing changes when the temperature control or vent mode is moved. Next, the plastic gear set will become brittle and break, which will sometimes allow the unit to work while making a ticking or clicking sound and then stopping. This is a common problem with most car heating and air conditioning systems.

How it works?

The air-mix door actuator is composed of a plastic housing, a small electric motor and a set of plastic gears. A door position sensor is also integrated into the unit to send feedback to the climate control computer. This actuator then moves the temperature and air direction doors inside the fireplace (box) designed to control mode settings such as temperature, floor, center ventilation, defrost and mode. fresh air or re-circulation. They also control hot and cold settings for the right and left passenger compartments. This direction depends on the temperature selected by the driver or passenger on the dual climate control system.

Start

You can buy OEM replacement actuators from Amazon for what garages pay them in most cases. You will need a kit that includes a 5.5 mm socket for Chevy, GMC, Cadillac, Ford and Lincoln vehicles.

Step 1: Remove the Bottom Control Panel or Glove Box

Using a small socket and ratchet remove the mounting bolts holding the plastic cover under the dash on the passenger side. These screws may be in hidden places so look around. Once you have located and removed all mounting screws, grasp the cover and gently pull it off the underside of the dash. This will expose the heating box with various controls including any wiring. Here’s what it looks like when the glovebox is removed to replace the blend door actuator.

Step 2: Remove the Door Actuator

This is a typical right-side temperature actuator used for dual climate control (also temperature for signal mode units). This actuator, which hangs underneath the box, is one of the easier to replace parts. Read more: how to make drumsticks for drums Start by using a small screwdriver to remove the seat belt clip on the harness for the actuator. These clamps can be brittle and break so be gentle. After release gently pull down the wire connector and remove it from the mixing door actuator. Check the connector for rust or corrosion and clean if necessary.

Step 3: Remove the Actuator

Locate and remove the actuator mounting screws. There should be two or three screws holding it in place. A small universal adapter may be needed to help remove screws in awkward places. Once removed, put the screws in a small carrying case so they don’t get lost. Once all mounting screws have been removed, the actuator should become loose. Grasp the actuator and pull it out of the bracket to remove.

Step 4: Rotate the louver

Before installing the new actuator, it is recommended that you rotate the blend door in both directions manually to ensure it does not get stuck resulting in damage to the new actuator. Grasp the door shaft and move it back and forth for full movement, it will move freely. If you are unable to move the blend door, an obstruction blocking the door’s movement will cause the new actuator to fail. These obstructions may include: pens, toothpicks, small toys, or bubble gum to name a few. If the door is jammed, remove the entire heater and resolve the problem before installing new equipment. To check the operation of the mixing door and double check that you are replacing the drive motor correctly, turn on the blower motor and work the doors each way. You should be able to feel the change in temperature or the degree of ventilation of the air.

Step 5: Matching the New Actuator

Compare the poor actuator with the new one. Be sure to check the wiring harness connectors that they should match exactly the same. Now the new part is ready to be installed.

Step 6: Install the new Air Mixer Door Actuator

Fit the new part into place when you install the mounting screws by hand. Be careful not to cross-thread the mounting screws as they thread into the plastic housing and can come apart easily, (do not over tighten). Once all screws are firmly in place, push the harness connector back into the actuator. You will hear a clicking sound indicating the correct installation of the connector. Read more: How to create hearts in minecraft

Step 7: Reinsert the Cover or Glove Box

Once the installation is complete, double-check your work and reinstall the plastic cover. This can take some jostling to get the bolt holes lined up to hang in there. Once the cover is in place, start mounting the manual mounting screws, after hand threading, install the rest of the screws. Do not tighten the first screw you inserted until all of the screws are gone as it will make the rest of the screws harder to install. Once the cover has been reinstalled, start the engine to check the repair work by turning on the climate control and moving the controls from hot and cold and from defrost to the middle and floor positions to ensure Make sure the new actuator is working properly.

Watch video

This is work in progress to gather additional tips and information before you begin.

Mixing door actuator position

Start by identifying the problem in defrost, mid, or floor mode, or inactive temperature mode. Then locate and determine the actuator to be replaced. These devices can be hung in front of you or in slightly more hidden places such as on the side of an HVAC conference. Sometimes they can be placed in inconvenient places like the top of a heating box. This repair can take longer as more parts need to be removed to gain access to the actuator. transmission needs to be replaced. Below is an example of the Silverado, Suburban, and Tahoe locations.

Circulating Actuator

Mode (Defrost between ventilation and floor) Actuator position

Left side temperature actuator position – Signal system temperature actuator

Suitable temperature mix door position

Have any questions?

If you have any questions about the mixer door actuator, feel free to visit our forum. If you would like to consult our community of mechanics, please do so, we will be happy to help. Read more: How to unlock beeline on bumble for free

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