Rick's Free Auto Repair Advice

Posts Tagged: mode door

Mode door

Mode door What is a mode door? A mode door is used to direct the flow of air in a vehicle. A typical heater box may use several mode doors and mode door actuators direct the flow of air to the windshield defroster, dash vents or floor vents. The mode door actuators on late-model vehicles are electric motors with position sensors that tell the HVAC control head the exact position of the mode door. On older vehicles, carmakers relied on vacuum motors to change the mode doors. On still older … Read More

AC light blinking Chrysler Minivans

Why does the AC light blink on Chrysler Minivans If the battery is disconnected on Chrysler minivans, the blend and mode door actuator motors “forget” their position and must be recalibrated. Thankfully, you don’t need a scan tool to do this. Just follow these steps: 1. Start the engine and set the blower motor to high. 2. Set the mode position to PANEL. 3. Open all the A/C outlets and set temperature to COLD. Move both sliders if van is equipped with passenger controls. 4. Push and hold the REAR … Read More

Recalibrate chrysler ac control head

How Recalibrate a Chrysler heater control The blend and mode doors on late model Chrysler vehicles are driven by DC servo motors. If the motors get out of synchronization, the control head doesn’t know where they are. That can result in cold air when you command heat and vice versa. It can also screw up where the air blows. Here’s how to perform a calibration routine on Caravan, Voyager, and Town and Country. It works on many other Chrysler products as well. 1. Turn Ignition switch to ON 2) Press … Read More


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