The control systems were cable actuated, and eventually, vacuum controls were introduced. When A/C became a popular option on vehicles in the mid to late 1970s, the systems were simple, except for some high levels vehicles, which were often the test bed of things to come. As you adjust the temperature up and down, the signals go through the actuator to complete the request, positioning the air door on the right position. The blend door actuator is a small electric motor. When the Winter Season begins, and you try to change the A/C settings on the Air Conditioning Climate Control from Cold air to hot air and you cannot control the air temperature. Why my car A/C is stuck in heat mode when the cooling mode is on?Ī malfunctioning Temperature Blend Door Actuator Motor could be the cause.
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