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What faults will occur if the car fan resistor is damaged?

1 Answers

OJake

07/29/25 2:46pm

Blower resistor mainly controls the blower speed. If the blower resistor is damaged, the blower speed will remain the same across different gear positions. After the blower resistor fails, the air volume control knob loses its speed regulation function. This is a component in the air conditioning system that is prone to damage. 1. Principle of car air conditioning: During heating, high-temperature coolant from the engine flows through the heater core. During cooling, the AC button needs to be pressed so that the compressor clutch engages and the engine drives the compressor to operate. 2. Additional information: When cleaning the air conditioning system, avoid using low-quality foam cleaners as they may damage the blower. There is a bearing in the blower; lack of lubrication in this bearing will cause abnormal noise during blower operation.

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