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Why is one of the two fans on the Accord not spinning while the other one is?

3 Answers

VonHector

09/06/25 3:32am

One is the radiator electric fan, used for engine cooling, while the other is the air conditioning electric fan, which only operates when the air conditioning is turned on. Below is relevant information about automotive electric fans: 1. Electric Fan Control Methods: Unlike engine-driven fans, automotive electric fans require adjustment of their operating status based on coolant temperature. Some are controlled by the vehicle's ECU, while others operate via a thermistor switch. Different vehicles employ varying electric fan control methods. 2. Composition Structure: Generally, an electric fan assembly includes the electric fan itself, mounting brackets, temperature sensors, thermal control switches, relays, wiring harnesses, etc. If an electric fan fails to operate, troubleshooting can be conducted based on these components.

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EmersonLynn

09/18/25 3:30am

I'm an experienced auto mechanic and have seen this issue many times. When one cooling fan is running while the other is idle, the first step is to determine whether the non-working fan has completely failed or is partially functional. Common causes include a burnt-out fan motor, blown fuse, or a faulty relay acting as the middleman. Another possibility is a malfunctioning temperature sensor failing to transmit coolant data to the ECU. Wiring degradation and loose connectors often compound the problem, especially during summer when engine bay temperatures soar. Check the engine coolant temperature gauge immediately - if it's rising rapidly, shut off the engine and call for a tow truck to avoid overheating and cylinder scoring. Never attempt to drive with this malfunction. Visit a repair shop to scan trouble codes and conduct thorough electrical system diagnostics.

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LeEloise

11/01/25 3:57am

Last time my car had the same issue, and it turned out to be the auxiliary fan connector rusting after being submerged in water. If the fan isn’t spinning, here’s how to diagnose it: First, check if the fan blades are obstructed by debris; then feel if the motor is hot (if it is, it’s likely an electrical issue); bypass the relay to test if it’s functioning. Don’t overlook potential culprits like coolant condition or radiator blockage. In my case, the fan motor wiring harness had exposed wires grounding out—replacing the harness fixed it immediately. After repairs, test if the fan operates correctly at both high and low speeds, especially ensuring it activates alongside the AC compressor for proper cooling. DIY repairs for such faults can be challenging without professional tools.

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