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I drive a Honda Civic 2008 model. I noticed that when driving, my car stereo momentarily switches off and back on after about 3-5 seconds when the radiator/condenser cooling fans come on. The lights on the instrument console & the headlights (when on at night) also flicker momentarily when the cooling fans come on. What could be the cause of this problem & its solution? Thanks.

  • Welcome to Motor Vehicle Maintenance & Repair! Is the car stereo the stock one or an aftermarket one? – Pᴀᴜʟsᴛᴇʀ2 Aug 28 at 15:07
  • A bad or loose ground connection somewhere. – Solar Mike Aug 28 at 17:17
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Car fans consume a lot of electricity, especially when first turning on.

Does your dashboard have a voltage gauge? If it did, you would probably see the voltage drop from 14v to less than 10v when the fans first turn on. After that the voltage would stabilize at 14v, or possibly a little bit lower.

This is why your cabin lights flicker when the fans first turn on. Lights will get dimmer as the voltage decreases, but your radio may be programmed to turn off when voltage drops below 12v.

If my diagnosis is correct, then you have nothing to worry about. It might be annoying, but it will not damage your car.

You can test this by purchasing a cheap multi-meter at a hardware or auto parts store. They typically cost under $15. With the dial set to voltage, hook the leads up the battery. It should read close to 14v when the car is running. When the fan turns on, like I said before, the voltage will briefly fall below 10v.

  • This is not normal for a 2008 Civic – Kitsunemimi Aug 29 at 12:55
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You could also check the connections to the radio because any corrosion/loseness in them would cause a voltage drop that is added to when the fan comes on.

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Like someone mentioned, fans take a lot of current draw when they start. Normally your battery would be able to absorb the momentary high load, if it isn't happening you may want to test your battery.

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