And then your car ac fan would fluctuate. So, the actuator’s system fails for any reason, the door may get stuck or break down. You know the actuators control the car doors open and close. The actuators can be another reason behind the blower motor speeding up and down. In that case, the solution is to find out if there is any partial blend open or not. Thus, you will find the fan speed may go out or slow down and a little amount of cold air coming inside the car. So, then only cool air comes inside the car.īut, for any reason, if the blend is a little bit open, then you will notice the blower is making a sound. And for this reason, no heat can be generated from the car engine. When you ON the air conditioning mode, the blend doors block all the heat sources. The blend door works completely depending on the atmosphere it’s in. Then check the blend door and fix the stuck issue. Here the plastic blend door isn’t working. In such a case, there is a possibility that the blower motor fan is in good condition. Sometimes, you will notice that the blower fan running at high speed with noise but cold air isn’t coming out of the vents. Here the only solution is to replace the blower motor. When you notice your car fan blower blowing a little amount of air, motor turning off and on frequently, then there is a possibility that it wears out for many years of use. Here are the reasons and solutions to your car blower speed fluctuation issues: 1. Conclusion Car Blower Motor Speeds Up and Slows Down.Will a bad capacitor cause a blower motor to run slow?.How To Take Care of Your Car’s Air Conditioners Fans.Car Blower Motor Speeds Up and Slows Down.
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