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What are the symptoms of a damaged car cooling fan resistor?

2 Answers

DiCayden

07/29/25 3:32am

The blower resistor mainly controls the speed of the blower. If the blower resistor is damaged, the blower will operate at the same speed across all gear settings. Once the blower resistor fails, the air volume control knob loses its speed adjustment function. Here are the specific details about car air conditioning: 1. Introduction: The car air conditioning system, abbreviated as car AC, is used to regulate and control the temperature, humidity, air cleanliness, and airflow inside the car cabin to optimal conditions. It provides a comfortable riding environment for passengers, reduces travel fatigue, and creates favorable working conditions for the driver, playing a crucial role in ensuring safe driving. 2. AC Layout: Different types of AC systems have varying layouts. Currently, integrated heating and cooling AC systems are widely used in passenger cars. The layout involves assembling components such as the evaporator, heater radiator, centrifugal blower, and control mechanism together, referred to as the AC unit assembly.

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DeEdward

08/12/25 7:21am

Last time I was driving, I noticed an issue with the cooling fan. Once the fan started, it would only spin at high speed like a top and wouldn't stop. At first, I didn't pay much attention, but later the engine bay became extremely hot, and the dashboard warning light came on—that's when I realized it was serious. The resistor controls the fan speed, and when it fails, the fan can't switch to low-speed mode. It becomes noisy, consumes more power, and fails to lower the temperature, which can easily lead to engine overheating or even a blown head gasket. I tried touching the fan connector myself—it was scorching hot. Later, I took it to a mechanic, who said resistor failures are quite common, often caused by aging wiring or voltage instability. If left unrepaired for a long time, the air conditioning can also be affected, losing its cooling capability. Eventually, you'd have to replace the part, or driving in summer would be pure misery.

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